Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

  f871de0... build: make use of 76 lib/*.h renamed files
  ffd8e12... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

  c087374... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

  13606bb... build: make use of 93 lib/*.c renamed files
  5b6e792... build: rename 93 lib/*.c files
  7d83dff... build: commit 13606bbfde follow-up 1

Start of related discussion thread:

  http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

  http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

  http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

  lib/curl_imap.h
  lib/curl_smtp.h

1 files changed, 85 insertions, 0 deletions

diff --git a/lib/idn_win32.c b/lib/idn_win32.c
new file mode 100644
index 000000000..9bc9cb810
--- /dev/null
+++ b/lib/idn_win32.c
@@ -0,0 +1,85 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+ /*
+  * IDN conversions using Windows kernel32 and normaliz libraries.
+  */
+
+#include "setup.h"
+
+#ifdef USE_WIN32_IDN
+
+#include "curl_multibyte.h"
+
+#include "curl_memory.h"
+/* The last #include file should be: */
+#include "memdebug.h"
+
+#ifdef WANT_IDN_PROTOTYPES
+WINBASEAPI int WINAPI IdnToAscii(DWORD, const WCHAR *, int, WCHAR *, int);
+WINBASEAPI int WINAPI IdnToUnicode(DWORD, const WCHAR *, int, WCHAR *, int);
+#endif
+
+#define IDN_MAX_LENGTH 255
+
+int curl_win32_idn_to_ascii(const char *in, char **out);
+int curl_win32_ascii_to_idn(const char *in, size_t in_len, char **out_utf8);
+
+int curl_win32_idn_to_ascii(const char *in, char **out)
+{
+  wchar_t *in_w = Curl_convert_UTF8_to_wchar(in);
+  if(in_w) {
+    wchar_t punycode[IDN_MAX_LENGTH];
+    if(IdnToAscii(0, in_w, -1, punycode, IDN_MAX_LENGTH) == 0) {
+      wprintf(L"ERROR %d converting to Punycode\n", GetLastError());
+      free(in_w);
+      return 0;
+    }
+    free(in_w);
+
+    *out = Curl_convert_wchar_to_UTF8(punycode);
+    if(!*out)
+      return 0;
+  }
+  return 1;
+}
+
+int curl_win32_ascii_to_idn(const char *in, size_t in_len, char **out_utf8)
+{
+  (void)in_len; /* unused */
+  if(in) {
+    WCHAR unicode[IDN_MAX_LENGTH];
+
+    if(IdnToUnicode(0, (wchar_t *)in, -1, unicode, IDN_MAX_LENGTH) == 0) {
+      wprintf(L"ERROR %d converting to Punycode\n", GetLastError());
+      return 0;
+    }
+    else {
+      *out_utf8 = Curl_convert_wchar_to_UTF8(unicode);
+      if(!*out_utf8)
+        return 0;
+    }
+  }
+  return 1;
+}
+
+#endif /* USE_WIN32_IDN */