Start untangling header inclusion in a way that does not affect

build times - tested, there is no measureable difference before and
after this commit.

In this change:

use asterisk/compat.h to include a small set of system headers:
inttypes.h, unistd.h, stddef.h, stddint.h, sys/types.h, stdarg.h,
stdlib.h, alloca.h, stdio.h

Where available, the inclusion is conditional on HAVE_FOO_H as determined
by autoconf.

Normally, source files should not include any of the above system headers,
and instead use either "asterisk.h" or "asterisk/compat.h" which does it
better. 

For the time being I have left alone second-level directories
(main/db1-ast, etc.).



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89333 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/iax2-parser.c

@@ -27,14 +27,9 @@
 
 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
-#include <sys/types.h>
 #include <sys/socket.h>
-#include <string.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
 
 #include "asterisk/frame.h"
 #include "asterisk/utils.h"