tidy-up: delete unused build configuration macros

Most of them feature guards:

- `CURL_INCLUDES_SYS_UIO` [1]
- `HAVE_ALLOCA_H` [2]
- `HAVE_CRYPTO_CLEANUP_ALL_EX_DATA` (unused since de71e68000c8624ea13f90b136f8734dd0fb1bdc)
- `HAVE_DLFCN_H`
- `HAVE_DLOPEN`
- `HAVE_DOPRNT`
- `HAVE_FCNTL`
- `HAVE_GETHOSTBYNAME` [3]
- `HAVE_GETOPT_H`
- `HAVE_GETPASS`
- `HAVE_GETPROTOBYNAME`
- `HAVE_GETSERVBYNAME`
- `HAVE_IDN_FREE*`
- `HAVE_INET_ADDR`
- `HAVE_IOCTL`
- `HAVE_KRB4`
- `HAVE_KRB_GET_OUR_IP_FOR_REALM`
- `HAVE_KRB_H`
- `HAVE_LDAPSSL_H`
- `HAVE_LDAP_INIT_FD`
- `HAVE_LIBDL`
- `HAVE_LIBNSL`
- `HAVE_LIBRESOLV*`
- `HAVE_LIBUCB`
- `HAVE_LL`
- `HAVE_LOCALTIME_R`
- `HAVE_MALLOC_H`
- `HAVE_MEMCPY`
- `HAVE_MEMORY_H`
- `HAVE_NETINET_IF_ETHER_H`
- `HAVE_NI_WITHSCOPEID`
- `HAVE_OPENSSL_CRYPTO_H`
- `HAVE_OPENSSL_ERR_H`
- `HAVE_OPENSSL_PEM_H`
- `HAVE_OPENSSL_PKCS12_H`
- `HAVE_OPENSSL_RAND_H`
- `HAVE_OPENSSL_RSA_H`
- `HAVE_OPENSSL_SSL_H`
- `HAVE_OPENSSL_X509_H`
- `HAVE_PEM_H`
- `HAVE_POLL`
- `HAVE_RAND_SCREEN`
- `HAVE_RAND_STATUS`
- `HAVE_RECVFROM`
- `HAVE_SETSOCKOPT`
- `HAVE_SETVBUF`
- `HAVE_SIZEOF_LONG_DOUBLE`
- `HAVE_SOCKIO_H`
- `HAVE_SOCK_OPTS`
- `HAVE_STDIO_H`
- `HAVE_STRCASESTR`
- `HAVE_STRFTIME`
- `HAVE_STRLCAT`
- `HAVE_STRNCMPI`
- `HAVE_STRNICMP`
- `HAVE_STRSTR`
- `HAVE_STRUCT_IN6_ADDR`
- `HAVE_TLD_H`
- `HAVE_TLD_STRERROR`
- `HAVE_UNAME`
- `HAVE_USLEEP`
- `HAVE_WINBER_H`
- `HAVE_WRITEV`
- `HAVE_X509_H`
- `LT_OBJDIR`
- `NEED_BASENAME_PROTO`
- `NOT_NEED_LIBNSL`
- `OPENSSL_NO_KRB5`
- `RECVFROM_TYPE*`
- `SIZEOF_LONG_DOUBLE`
- `STRERROR_R_TYPE_ARG3`
- `USE_YASSLEMUL`
- `_USRDLL` (from CMake) [4]

[1] Related parts in `m4/curl-functions.m4` and `configure.ac` might
    also be deleted.

[2] Related comment can possibly be deleted in
    `packages/vms/generate_config_vms_h_curl.com`.

[3] There are more instances of this in autotools, but I did not dare to
    touch those. Looked like it's used to detect socket support.

[4] This is necessary for MFC (Microsoft Foundation Class) DLLs to
    force linking MFC components statically to the DLL. `libcurl.dll`
    does not use MFC, so we can delete this define.
    Ref: https://docs.microsoft.com/cpp/build/regular-dlls-statically-linked-to-mfc

Script that can help finding unused settings like above:
```shell

autoheader configure.ac  # generate lib/curl_config.h.in

{
  grep -o -E    'set\([A-Z][A-Z0-9_]{3,}'          CMake/Platforms/WindowsCache.cmake | sed -E 's|set\(||g'
  grep -o -E -h '#define +[A-Z][A-Z0-9_]{3,}'      lib/config-*.h                     | sed -E 's|#define +||g'
  grep -o -E    '#cmakedefine +[A-Z][A-Z0-9_]{3,}' lib/curl_config.h.cmake            | sed -E 's|#cmakedefine +||g'
  grep -o -E    '#undef +[A-Z][A-Z0-9_]{3,}'       lib/curl_config.h.in               | sed -E 's|#undef +||g'
} | sort -u | grep -v -F 'HEADER_CURL_' | while read -r def; do
  c="$(git grep -w -F "${def}" | grep -v -E -c '(/libcurl\.tmpl|^lib/config-|^lib/curl_config\.h\.cmake|^CMakeLists\.txt|^CMake/Platforms/WindowsCache\.cmake|^packages/vms/config_h\.com|^m4/curl-functions\.m4|^acinclude\.m4|^configure\.ac)')"
  if [ "${c}" = '0' ]; then
    echo "${def}"
  fi
done
```

Reviewed-by: Daniel Stenberg
Closes #9044

1 files changed, 0 insertions, 196 deletions

diff --git a/acinclude.m4 b/acinclude.m4
index 313f4c696..1d9a30bfc 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -385,48 +385,6 @@ AC_DEFUN([CURL_CHECK_HEADER_WINLDAP], [
 ])
 
 
-dnl CURL_CHECK_HEADER_WINBER
-dnl -------------------------------------------------
-dnl Check for compilable and valid winber.h header
-
-AC_DEFUN([CURL_CHECK_HEADER_WINBER], [
-  AC_REQUIRE([CURL_CHECK_HEADER_WINLDAP])dnl
-  AC_CACHE_CHECK([for winber.h], [curl_cv_header_winber_h], [
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#undef inline
-#ifdef HAVE_WINDOWS_H
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
-#endif
-#include <winldap.h>
-#include <winber.h>
-      ]],[[
-#if defined(__CYGWIN__) || defined(__CEGCC__)
-        HAVE_WINBER_H shall not be defined.
-#else
-        BERVAL *bvp = NULL;
-        BerElement *bep = ber_init(bvp);
-        ber_free(bep, 1);
-#endif
-      ]])
-    ],[
-      curl_cv_header_winber_h="yes"
-    ],[
-      curl_cv_header_winber_h="no"
-    ])
-  ])
-  case "$curl_cv_header_winber_h" in
-    yes)
-      AC_DEFINE_UNQUOTED(HAVE_WINBER_H, 1,
-        [Define to 1 if you have the winber.h header file.])
-      ;;
-  esac
-])
-
-
 dnl CURL_CHECK_HEADER_LBER
 dnl -------------------------------------------------
 dnl Check for compilable and valid lber.h header,
@@ -602,58 +560,6 @@ AC_DEFUN([CURL_CHECK_HEADER_LDAP_SSL], [
 ])
 
 
-dnl CURL_CHECK_HEADER_LDAPSSL
-dnl -------------------------------------------------
-dnl Check for compilable and valid ldapssl.h header
-
-AC_DEFUN([CURL_CHECK_HEADER_LDAPSSL], [
-  AC_REQUIRE([CURL_CHECK_HEADER_LDAP])dnl
-  AC_CACHE_CHECK([for ldapssl.h], [curl_cv_header_ldapssl_h], [
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#undef inline
-#ifdef HAVE_WINDOWS_H
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
-#else
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-#endif
-#ifndef NULL
-#define NULL (void *)0
-#endif
-#ifndef LDAP_DEPRECATED
-#define LDAP_DEPRECATED 1
-#endif
-#ifdef NEED_LBER_H
-#include <lber.h>
-#endif
-#ifdef HAVE_LDAP_H
-#include <ldap.h>
-#endif
-#include <ldapssl.h>
-      ]],[[
-        char *cert_label = NULL;
-        LDAP *ldp = ldap_ssl_init("dummy", LDAPS_PORT, cert_label);
-      ]])
-    ],[
-      curl_cv_header_ldapssl_h="yes"
-    ],[
-      curl_cv_header_ldapssl_h="no"
-    ])
-  ])
-  case "$curl_cv_header_ldapssl_h" in
-    yes)
-      AC_DEFINE_UNQUOTED(HAVE_LDAPSSL_H, 1,
-        [Define to 1 if you have the ldapssl.h header file.])
-      ;;
-  esac
-])
-
-
 dnl CURL_CHECK_LIBS_WINLDAP
 dnl -------------------------------------------------
 dnl Check for libraries needed for WINLDAP support,
@@ -858,108 +764,6 @@ AC_DEFUN([CURL_CHECK_LIBS_LDAP], [
 ])
 
 
-dnl CURL_CHECK_HEADER_MALLOC
-dnl -------------------------------------------------
-dnl Check for compilable and valid malloc.h header,
-dnl and check if it is needed even with stdlib.h
-
-AC_DEFUN([CURL_CHECK_HEADER_MALLOC], [
-  AC_CACHE_CHECK([for malloc.h], [curl_cv_header_malloc_h], [
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#include <malloc.h>
-      ]],[[
-        void *p = malloc(10);
-        void *q = calloc(10,10);
-        free(p);
-        free(q);
-      ]])
-    ],[
-      curl_cv_header_malloc_h="yes"
-    ],[
-      curl_cv_header_malloc_h="no"
-    ])
-  ])
-  if test "$curl_cv_header_malloc_h" = "yes"; then
-    AC_DEFINE_UNQUOTED(HAVE_MALLOC_H, 1,
-      [Define to 1 if you have the malloc.h header file.])
-    #
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#include <stdlib.h>
-      ]],[[
-        void *p = malloc(10);
-        void *q = calloc(10,10);
-        free(p);
-        free(q);
-      ]])
-    ],[
-      curl_cv_need_header_malloc_h="no"
-    ],[
-      curl_cv_need_header_malloc_h="yes"
-    ])
-    #
-    case "$curl_cv_need_header_malloc_h" in
-      yes)
-        AC_DEFINE_UNQUOTED(NEED_MALLOC_H, 1,
-          [Define to 1 if you need the malloc.h header file even with stdlib.h])
-        ;;
-    esac
-  fi
-])
-
-
-dnl CURL_CHECK_HEADER_MEMORY
-dnl -------------------------------------------------
-dnl Check for compilable and valid memory.h header,
-dnl and check if it is needed even with stdlib.h for
-dnl memory related functions.
-
-AC_DEFUN([CURL_CHECK_HEADER_MEMORY], [
-  AC_CACHE_CHECK([for memory.h], [curl_cv_header_memory_h], [
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#include <memory.h>
-      ]],[[
-        void *p = malloc(10);
-        void *q = calloc(10,10);
-        free(p);
-        free(q);
-      ]])
-    ],[
-      curl_cv_header_memory_h="yes"
-    ],[
-      curl_cv_header_memory_h="no"
-    ])
-  ])
-  if test "$curl_cv_header_memory_h" = "yes"; then
-    AC_DEFINE_UNQUOTED(HAVE_MEMORY_H, 1,
-      [Define to 1 if you have the memory.h header file.])
-    #
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-#include <stdlib.h>
-      ]],[[
-        void *p = malloc(10);
-        void *q = calloc(10,10);
-        free(p);
-        free(q);
-      ]])
-    ],[
-      curl_cv_need_header_memory_h="no"
-    ],[
-      curl_cv_need_header_memory_h="yes"
-    ])
-    #
-    case "$curl_cv_need_header_memory_h" in
-      yes)
-        AC_DEFINE_UNQUOTED(NEED_MEMORY_H, 1,
-          [Define to 1 if you need the memory.h header file even with stdlib.h])
-        ;;
-    esac
-  fi
-])
-
 dnl TYPE_SOCKADDR_STORAGE
 dnl -------------------------------------------------
 dnl Check for struct sockaddr_storage. Most IPv6-enabled