dix: 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>

dix/dispatch.h

@@ -23,17 +23,17 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 ********************************************************/
 
+#ifndef DISPATCH_H
+#define DISPATCH_H 1
+
+#include <dix-config.h>
+
 /*
  * This prototypes the dispatch.c module (except for functions declared in
  * global headers), plus related dispatch procedures from devices.c, events.c,
  * extension.c, property.c.
  */
 
-#include <dix-config.h>
-
-#ifndef DISPATCH_H
-#define DISPATCH_H 1
-
 int ProcAllocColor(ClientPtr /* client */ );
 int ProcAllocColorCells(ClientPtr /* client */ );
 int ProcAllocColorPlanes(ClientPtr /* client */ );

dix/enterleave.h

@@ -24,11 +24,11 @@
  *
  */
 
-#include <dix-config.h>
-
 #ifndef ENTERLEAVE_H
 #define ENTERLEAVE_H
 
+#include <dix-config.h>
+
 #include <dix.h> /* DoFocusEvents() */
 
 extern void DoEnterLeaveEvents(DeviceIntPtr pDev,