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, 77 insertions, 0 deletions

diff --git a/lib/socks.h b/lib/socks.h
new file mode 100644
index 000000000..0ce0bd044
--- /dev/null
+++ b/lib/socks.h
@@ -0,0 +1,77 @@
+#ifndef HEADER_CURL_SOCKS_H
+#define HEADER_CURL_SOCKS_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, 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"
+
+#ifdef CURL_DISABLE_PROXY
+#define Curl_SOCKS4(a,b,c,d,e,f) CURLE_NOT_BUILT_IN
+#define Curl_SOCKS5(a,b,c,d,e,f) CURLE_NOT_BUILT_IN
+#else
+/*
+ * Helper read-from-socket functions. Does the same as Curl_read() but it
+ * blocks until all bytes amount of buffersize will be read. No more, no less.
+ *
+ * This is STUPID BLOCKING behaviour which we frown upon, but right now this
+ * is what we have...
+ */
+int Curl_blockread_all(struct connectdata *conn,
+                       curl_socket_t sockfd,
+                       char *buf,
+                       ssize_t buffersize,
+                       ssize_t *n);
+
+/*
+ * This function logs in to a SOCKS4(a) proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLcode Curl_SOCKS4(const char *proxy_name,
+                     const char *hostname,
+                     int remote_port,
+                     int sockindex,
+                     struct connectdata *conn,
+                     bool protocol4a);
+
+/*
+ * This function logs in to a SOCKS5 proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLcode Curl_SOCKS5(const char *proxy_name,
+                     const char *proxy_password,
+                     const char *hostname,
+                     int remote_port,
+                     int sockindex,
+                     struct connectdata *conn);
+
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+/*
+ * This function handles the sockss5 gssapie negotiation and initialisation
+ */
+CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
+                                      struct connectdata *conn);
+#endif
+
+#endif /* CURL_DISABLE_PROXY */
+
+#endif  /* HEADER_CURL_SOCKS_H */
+