loader: Include fewer headers from xf86Module.h

This looks like more, but only if you don't compare it to the number
pulled in by misc.h.

Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Adam Jackson <ajax@redhat.com>

hw/xfree86/common/xf86Module.h

@@ -41,8 +41,10 @@
 #ifndef _XF86MODULE_H
 #define _XF86MODULE_H
 
-#include "misc.h"
-#include "extension.h"
+#include <X11/Xfuncproto.h>
+#include <X11/Xdefs.h>
+#include <X11/Xmd.h>
+
 #ifndef NULL
 #define NULL ((void *)0)
 #endif