[mutter] cursor-tracker: Include gdk/gdkx.h

[Rui Matos <rtcm src gnome org>]

commit 8358b5dd24ed85c6bc8ba9a025b905349be54eff
Author: Rui Matos <tiagomatos gmail com>
Date:   Thu Mar 6 19:19:52 2014 +0100

    cursor-tracker: Include gdk/gdkx.h
    
    Needed for the call to gdk_x11_device_manager_lookup() introduced
    in in the previous commit.

 src/core/meta-cursor-tracker.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/core/meta-cursor-tracker.c b/src/core/meta-cursor-tracker.c
index af58af8..bf6bd69 100644
--- a/src/core/meta-cursor-tracker.c
+++ b/src/core/meta-cursor-tracker.c
@@ -34,6 +34,7 @@
 #include <clutter/clutter.h>
 
 #include <gdk/gdk.h>
+#include <gdk/gdkx.h>
 
 #include <X11/cursorfont.h>
 #include <X11/extensions/Xfixes.h>