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, 12 insertions, 12 deletions

diff --git a/lib/README.hostip b/lib/README.hostip
index 890187187..9723b93fd 100644
--- a/lib/README.hostip
+++ b/lib/README.hostip
@@ -1,7 +1,7 @@
- curl_hostip.c explained
+ hostip.c explained
  ==================
 
- The main COMPILE-TIME DEFINES to keep in mind when reading the curl_host*.c
+ The main COMPILE-TIME DEFINES to keep in mind when reading the host*.c
  source file are these:
 
  CURLRES_IPV6 - this host has getaddrinfo() and family, and thus we use
@@ -21,15 +21,15 @@
  libcurl is not built to use an asynchronous resolver, CURLRES_SYNCH is
  defined.
 
- The curl_host*.c sources files are split up like this:
+ The host*.c sources files are split up like this:
 
- curl_hostip.c   - method-independent resolver functions and utility functions
- curl_hostasyn.c - functions for asynchronous name resolves
- curl_hostsyn.c  - functions for synchronous name resolves
- curl_hostares.c - functions for ares-using name resolves
- curl_hostthre.c - functions for threaded name resolves
- curl_hostip4.c  - ipv4-specific functions
- curl_hostip6.c  - ipv6-specific functions
+ hostip.c   - method-independent resolver functions and utility functions
+ hostasyn.c - functions for asynchronous name resolves
+ hostsyn.c  - functions for synchronous name resolves
+ hostares.c - functions for ares-using name resolves
+ hostthre.c - functions for threaded name resolves
+ hostip4.c  - ipv4-specific functions
+ hostip6.c  - ipv6-specific functions
 
- The curl_hostip.h is the single united header file for all this. It defines
- the CURLRES_* defines based on the config*.h and curl_setup.h defines.
+ The hostip.h is the single united header file for all this. It defines the
+ CURLRES_* defines based on the config*.h and setup.h defines.