Cleanup of config/includes.

Remove a use of AH_BOTTOM from configure.ac. This macro is used by
autoheader to add '#include' of some include file to the end of
config.h.in and then to config.h. OpenOCD can be built with a custom
config.h, so it's preferable to move these '#include' statement directly
in the C files that need them dropping this unneeded dependency.

It also causes problems when I want to use the gnulib library (which
comes with its own Makefile, and does not have the same include path as
the top-level Makefile).

So this change touches a lot of files, but is actually really simple. It
does not affect functionality at all.

Change-Id: I52c70bf15eb2edc1dd10e0fde23b2bcd4caec000
Signed-off-by: Tim Newsome <tim@sifive.com>
Reviewed-on: http://openocd.zylin.com/6171
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/helper/system.h

@@ -21,6 +21,15 @@
 #ifndef OPENOCD_HELPER_SYSTEM_H
 #define OPENOCD_HELPER_SYSTEM_H
 
+/* +++ platform specific headers +++ */
+#ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#endif
+/* --- platform specific headers --- */
+
 /* standard C library header files */
 #include <stdio.h>
 #include <stdlib.h>
@@ -34,15 +43,6 @@
 #include <sys/time.h>
 #endif
 
-/* +++ platform specific headers +++ */
-#ifdef _WIN32
-#include <winsock2.h>
-#include <ws2tcpip.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#endif
-/* --- platform specific headers --- */
-
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif