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, 0 insertions, 66 deletions

diff --git a/lib/curl_if2ip.h b/lib/curl_if2ip.h
deleted file mode 100644
index 858ec2f5b..000000000
--- a/lib/curl_if2ip.h
+++ /dev/null
@@ -1,66 +0,0 @@
-#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 "curl_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 */