glamor: Make glamor_sync_init work with --disable-xshmfence

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

glamor/glamor_sync.c

@@ -97,6 +97,9 @@ glamor_sync_init(ScreenPtr screen)
 #ifdef HAVE_XSHMFENCE
 	if (!miSyncShmScreenInit(screen))
 		return FALSE;
+#else
+	if (!miSyncSetup(screen))
+		return FALSE;
 #endif
 
 	screen_funcs = miSyncGetScreenFuncs(screen);