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_strtok.c b/lib/curl_strtok.c
deleted file mode 100644
index 33bdd96af..000000000
--- a/lib/curl_strtok.c
+++ /dev/null
@@ -1,66 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2007, 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"
-
-#ifndef HAVE_STRTOK_R
-#include <stddef.h>
-
-#include "curl_strtok.h"
-
-char *
-Curl_strtok_r(char *ptr, const char *sep, char **end)
-{
-  if(!ptr)
-    /* we got NULL input so then we get our last position instead */
-    ptr = *end;
-
-  /* pass all letters that are including in the separator string */
-  while(*ptr && strchr(sep, *ptr))
-    ++ptr;
-
-  if(*ptr) {
-    /* so this is where the next piece of string starts */
-    char *start = ptr;
-
-    /* set the end pointer to the first byte after the start */
-    *end = start + 1;
-
-    /* scan through the string to find where it ends, it ends on a
-       null byte or a character that exists in the separator string */
-    while(**end && !strchr(sep, **end))
-      ++*end;
-
-    if(**end) {
-      /* the end is not a null byte */
-      **end = '\0';  /* zero terminate it! */
-      ++*end;        /* advance the last pointer to beyond the null byte */
-    }
-
-    return start; /* return the position where the string starts */
-  }
-
-  /* we ended up on a null byte, there are no more strings to find! */
-  return NULL;
-}
-
-#endif /* this was only compiled if strtok_r wasn't present */