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, 107 insertions, 0 deletions

diff --git a/lib/connect.h b/lib/connect.h
new file mode 100644
index 000000000..f84361f2e
--- /dev/null
+++ b/lib/connect.h
@@ -0,0 +1,107 @@
+#ifndef HEADER_CURL_CONNECT_H
+#define HEADER_CURL_CONNECT_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"
+
+#include "nonblock.h" /* for curlx_nonblock(), formerly Curl_nonblock() */
+#include "sockaddr.h"
+
+CURLcode Curl_is_connected(struct connectdata *conn,
+                           int sockindex,
+                           bool *connected);
+
+CURLcode Curl_connecthost(struct connectdata *conn,
+                          const struct Curl_dns_entry *host, /* connect to
+                                                                this */
+                          curl_socket_t *sockconn, /* not set if error */
+                          Curl_addrinfo **addr, /* the one we used */
+                          bool *connected); /* truly connected? */
+
+/* generic function that returns how much time there's left to run, according
+   to the timeouts set */
+long Curl_timeleft(struct SessionHandle *data,
+                   struct timeval *nowp,
+                   bool duringconnect);
+
+#define DEFAULT_CONNECT_TIMEOUT 300000 /* milliseconds == five minutes */
+
+/*
+ * Used to extract socket and connectdata struct for the most recent
+ * transfer on the given SessionHandle.
+ *
+ * The returned socket will be CURL_SOCKET_BAD in case of failure!
+ */
+curl_socket_t Curl_getconnectinfo(struct SessionHandle *data,
+                                  struct connectdata **connp);
+
+#ifdef USE_WINSOCK
+/* When you run a program that uses the Windows Sockets API, you may
+   experience slow performance when you copy data to a TCP server.
+
+   http://support.microsoft.com/kb/823764
+
+   Work-around: Make the Socket Send Buffer Size Larger Than the Program Send
+   Buffer Size
+
+*/
+void Curl_sndbufset(curl_socket_t sockfd);
+#else
+#define Curl_sndbufset(y) Curl_nop_stmt
+#endif
+
+void Curl_updateconninfo(struct connectdata *conn, curl_socket_t sockfd);
+void Curl_persistconninfo(struct connectdata *conn);
+int Curl_closesocket(struct connectdata *conn, curl_socket_t sock);
+
+/*
+ * The Curl_sockaddr_ex structure is basically libcurl's external API
+ * curl_sockaddr structure with enough space available to directly hold any
+ * protocol-specific address structures. The variable declared here will be
+ * used to pass / receive data to/from the fopensocket callback if this has
+ * been set, before that, it is initialized from parameters.
+ */
+struct Curl_sockaddr_ex {
+  int family;
+  int socktype;
+  int protocol;
+  unsigned int addrlen;
+  union {
+    struct sockaddr addr;
+    struct Curl_sockaddr_storage buff;
+  } _sa_ex_u;
+};
+#define sa_addr _sa_ex_u.addr
+
+/*
+ * Create a socket based on info from 'conn' and 'ai'.
+ *
+ * Fill in 'addr' and 'sockfd' accordingly if OK is returned. If the open
+ * socket callback is set, used that!
+ *
+ */
+CURLcode Curl_socket(struct connectdata *conn,
+                     const Curl_addrinfo *ai,
+                     struct Curl_sockaddr_ex *addr,
+                     curl_socket_t *sockfd);
+
+#endif /* HEADER_CURL_CONNECT_H */