Fix build of composite, dix, and randr when Xinerama is disabled.

dix/events.c

@@ -695,6 +695,13 @@ XineramaChangeToCursor(CursorPtr cursor)
     }
 }
 
+#else
+#define SyntheticMotion(x, y) \
+     PostSyntheticMotion(x, y, \
+                         0, \
+                         syncEvents.playingEvents ? \
+                           syncEvents.time.milliseconds : \
+                           currentTime.milliseconds);
 
 #endif  /* PANORAMIX */