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

lib/netrc.c

@@ -0,0 +1,186 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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 "setup.h"
+
+#ifdef HAVE_PWD_H
+#include <pwd.h>
+#endif
+#ifdef __VMS
+#include <unixlib.h>
+#endif
+
+#include <curl/curl.h>
+#include "netrc.h"
+
+#include "strequal.h"
+#include "strtok.h"
+#include "curl_memory.h"
+#include "rawstr.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/* Get user and password from .netrc when given a machine name */
+
+enum host_lookup_state {
+  NOTHING,
+  HOSTFOUND,    /* the 'machine' keyword was found */
+  HOSTVALID     /* this is "our" machine! */
+};
+
+/*
+ * @unittest: 1304
+ */
+int Curl_parsenetrc(const char *host,
+                    char *login,
+                    char *password,
+                    char *netrcfile)
+{
+  FILE *file;
+  int retcode=1;
+  int specific_login = (login[0] != 0);
+  char *home = NULL;
+  bool home_alloc = FALSE;
+  bool netrc_alloc = FALSE;
+  enum host_lookup_state state=NOTHING;
+
+  char state_login=0;      /* Found a login keyword */
+  char state_password=0;   /* Found a password keyword */
+  int state_our_login=FALSE;  /* With specific_login, found *our* login name */
+
+#define NETRC DOT_CHAR "netrc"
+
+  if(!netrcfile) {
+    home = curl_getenv("HOME"); /* portable environment reader */
+    if(home) {
+      home_alloc = TRUE;
+#if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
+    }
+    else {
+      struct passwd *pw;
+      pw= getpwuid(geteuid());
+      if(pw) {
+#ifdef __VMS
+        home = decc_translate_vms(pw->pw_dir);
+#else
+        home = pw->pw_dir;
+#endif
+      }
+#endif
+    }
+
+    if(!home)
+      return -1;
+
+    netrcfile = curl_maprintf("%s%s%s", home, DIR_CHAR, NETRC);
+    if(!netrcfile) {
+      if(home_alloc)
+        free(home);
+      return -1;
+    }
+    netrc_alloc = TRUE;
+  }
+
+  file = fopen(netrcfile, "r");
+  if(file) {
+    char *tok;
+    char *tok_buf;
+    bool done=FALSE;
+    char netrcbuffer[256];
+    int  netrcbuffsize = (int)sizeof(netrcbuffer);
+
+    while(!done && fgets(netrcbuffer, netrcbuffsize, file)) {
+      tok=strtok_r(netrcbuffer, " \t\n", &tok_buf);
+      while(!done && tok) {
+
+        if(login[0] && password[0]) {
+          done=TRUE;
+          break;
+        }
+
+        switch(state) {
+        case NOTHING:
+          if(Curl_raw_equal("machine", tok)) {
+            /* the next tok is the machine name, this is in itself the
+               delimiter that starts the stuff entered for this machine,
+               after this we need to search for 'login' and
+               'password'. */
+            state=HOSTFOUND;
+          }
+          break;
+        case HOSTFOUND:
+          if(Curl_raw_equal(host, tok)) {
+            /* and yes, this is our host! */
+            state=HOSTVALID;
+            retcode=0; /* we did find our host */
+          }
+          else
+            /* not our host */
+            state=NOTHING;
+          break;
+        case HOSTVALID:
+          /* we are now parsing sub-keywords concerning "our" host */
+          if(state_login) {
+            if(specific_login) {
+              state_our_login = Curl_raw_equal(login, tok);
+            }
+            else {
+              strncpy(login, tok, LOGINSIZE-1);
+            }
+            state_login=0;
+          }
+          else if(state_password) {
+            if(state_our_login || !specific_login) {
+              strncpy(password, tok, PASSWORDSIZE-1);
+            }
+            state_password=0;
+          }
+          else if(Curl_raw_equal("login", tok))
+            state_login=1;
+          else if(Curl_raw_equal("password", tok))
+            state_password=1;
+          else if(Curl_raw_equal("machine", tok)) {
+            /* ok, there's machine here go => */
+            state = HOSTFOUND;
+            state_our_login = FALSE;
+          }
+          break;
+        } /* switch (state) */
+
+        tok = strtok_r(NULL, " \t\n", &tok_buf);
+      } /* while(tok) */
+    } /* while fgets() */
+
+    fclose(file);
+  }
+
+  if(home_alloc)
+    free(home);
+  if(netrc_alloc)
+    free(netrcfile);
+
+  return retcode;
+}