Fix dri_util.c build with new headers.

Submitted by:	John Lightsey <john@nixnuts.net>

src/mesa/drivers/dri/common/dri_util.c

@@ -50,7 +50,7 @@
 #include "drm_sarea.h"
 #include "glcontextmodes.h"
 
-#ifndef GLX_OML_sync_control
+#ifndef PFNGLXGETMSCRATEOMLPROC
 typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRInativeDisplay *dpy, __DRIid drawable, int32_t *numerator, int32_t *denominator);
 #endif