mi: move include guards up to wrap the whole file

See: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
Signed-off-by: Mike Gelfand <mikedld@mikedld.com>

mi/miinitext.h

@@ -71,13 +71,13 @@ SOFTWARE.
  * 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
 
-#ifndef MIINITEXT_H
-#define MIINITEXT_H
-
 void ListStaticExtensions(void);
 
 #endif /* MIINITEXT_H */

mi/mioverlay.h

@@ -1,11 +1,10 @@
+#ifndef __MIOVERLAY_H
+#define __MIOVERLAY_H
 
 #ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
 #endif
 
-#ifndef __MIOVERLAY_H
-#define __MIOVERLAY_H
-
 typedef void (*miOverlayTransFunc) (ScreenPtr, int, BoxPtr);
 typedef Bool (*miOverlayInOverlayFunc) (WindowPtr);
 

mi/miscanfill.h

@@ -26,12 +26,13 @@ from The Open Group.
 
 */
 
+#ifndef SCANFILLINCLUDED
+#define SCANFILLINCLUDED
+
 #ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
 #endif
 
-#ifndef SCANFILLINCLUDED
-#define SCANFILLINCLUDED
 /*
  *     scanfill.h
  *

mi/mivalidate.h

@@ -26,13 +26,13 @@ from The Open Group.
 
 */
 
+#ifndef MIVALIDATE_H
+#define MIVALIDATE_H
+
 #ifdef HAVE_DIX_CONFIG_H
 #include <dix-config.h>
 #endif
 
-#ifndef MIVALIDATE_H
-#define MIVALIDATE_H
-
 #include "regionstr.h"
 
 typedef union _Validate {