Inclusion cleanups in sources

Try to do inclusions in the same sequence, more or less.

gdk/x11/xsettings-common.c

@@ -20,15 +20,17 @@
  *
  * Author:  Owen Taylor, Red Hat, Inc.
  */
+
 #include "config.h"
+
+#include "xsettings-common.h"
+
 #include "string.h"
 #include "stdlib.h"
 
 #include <X11/Xlib.h>
 #include <X11/Xmd.h>		/* For CARD32 */
 
-#include "xsettings-common.h"
-
 XSettingsSetting *
 xsettings_setting_copy (XSettingsSetting *setting)
 {