mi: drop including dix-config.h from headers

It needs to be included from the very top of source files anyways,
should not be done from individual headers.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

mi/miinitext.h

@@ -70,14 +70,9 @@ SOFTWARE.
  * the sale, use or other dealings in this Software without prior written
  * authorization from the copyright holder(s) and author(s).
  */
-
 #ifndef MIINITEXT_H
 #define MIINITEXT_H
 
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
 void ListStaticExtensions(void);
 
 #endif /* MIINITEXT_H */

mi/mioverlay.h

@@ -1,10 +1,6 @@
 #ifndef __MIOVERLAY_H
 #define __MIOVERLAY_H
 
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
 typedef void (*miOverlayTransFunc) (ScreenPtr, int, BoxPtr);
 typedef Bool (*miOverlayInOverlayFunc) (WindowPtr);
 

mi/miscanfill.h

@@ -25,14 +25,9 @@ other dealings in this Software without prior written authorization
 from The Open Group.
 
 */
-
 #ifndef SCANFILLINCLUDED
 #define SCANFILLINCLUDED
 
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
 /*
  *     scanfill.h
  *

mi/mivalidate.h

@@ -29,10 +29,6 @@ from The Open Group.
 #ifndef MIVALIDATE_H
 #define MIVALIDATE_H
 
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
 #include "regionstr.h"
 
 typedef union _Validate {