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, 61 insertions, 0 deletions

diff --git a/tests/server/tftp.h b/tests/server/tftp.h
new file mode 100644
index 000000000..0650efe6a
--- /dev/null
+++ b/tests/server/tftp.h
@@ -0,0 +1,61 @@
+#ifndef HEADER_CURL_SERVER_TFTP_H
+#define HEADER_CURL_SERVER_TFTP_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 "server_setup.h"
+
+/* This file is a rewrite/clone of the arpa/tftp.h file for systems without
+   it. */
+
+#define SEGSIZE 512 /* data segment size */
+
+#if defined(__GNUC__) && ((__GNUC__ >= 3) || \
+  ((__GNUC__ == 2) && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ >= 7)))
+#  define PACKED_STRUCT __attribute__((__packed__))
+#else
+#  define PACKED_STRUCT /*NOTHING*/
+#endif
+
+/* Using a packed struct as binary in a program is begging for problems, but
+   the tftpd server was written like this so we have this struct here to make
+   things build. */
+
+struct tftphdr {
+  short th_opcode;         /* packet type */
+  unsigned short th_block; /* all sorts of things */
+  char th_data[1];         /* data or error string */
+} PACKED_STRUCT;
+
+#define th_stuff th_block
+#define th_code  th_block
+#define th_msg   th_data
+
+#define EUNDEF    0
+#define ENOTFOUND 1
+#define EACCESS   2
+#define ENOSPACE  3
+#define EBADOP    4
+#define EBADID    5
+#define EEXISTS   6
+#define ENOUSER   7
+
+#endif /* HEADER_CURL_SERVER_TFTP_H */