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, 66 insertions, 0 deletions

diff --git a/lib/if2ip.h b/lib/if2ip.h
new file mode 100644
index 000000000..70842457c
--- /dev/null
+++ b/lib/if2ip.h
@@ -0,0 +1,66 @@
+#ifndef HEADER_CURL_IF2IP_H
+#define HEADER_CURL_IF2IP_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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.
+ *
+ ***************************************************************************/
+#include "setup.h"
+
+bool Curl_if_is_interface_name(const char *interf);
+char *Curl_if2ip(int af, const char *interf, char *buf, int buf_size);
+
+#ifdef __INTERIX
+
+/* Nedelcho Stanev's work-around for SFU 3.0 */
+struct ifreq {
+#define IFNAMSIZ 16
+#define IFHWADDRLEN 6
+  union {
+    char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */
+  } ifr_ifrn;
+
+ union {
+   struct sockaddr ifru_addr;
+   struct sockaddr ifru_broadaddr;
+   struct sockaddr ifru_netmask;
+   struct sockaddr ifru_hwaddr;
+   short ifru_flags;
+   int ifru_metric;
+   int ifru_mtu;
+ } ifr_ifru;
+};
+
+/* This define was added by Daniel to avoid an extra #ifdef INTERIX in the
+   C code. */
+
+#define ifr_name ifr_ifrn.ifrn_name /* interface name */
+#define ifr_addr ifr_ifru.ifru_addr /* address */
+#define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
+#define ifr_netmask ifr_ifru.ifru_netmask /* interface net mask */
+#define ifr_flags ifr_ifru.ifru_flags /* flags */
+#define ifr_hwaddr ifr_ifru.ifru_hwaddr /* MAC address */
+#define ifr_metric ifr_ifru.ifru_metric /* metric */
+#define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
+
+#define SIOCGIFADDR _IOW('s', 102, struct ifreq) /* Get if addr */
+
+#endif /* __INTERIX */
+
+#endif /* HEADER_CURL_IF2IP_H */