[mutter] wayland-stage: Add missing include

[Jasper St. Pierre <jstpierre src gnome org>]

commit eba5648c2708fbc78b3a6ad65f8f81d35cabdb56
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Apr 21 21:06:53 2014 -0400

    wayland-stage: Add missing include
    
    Again, had it locally, forgot to amend.

 src/wayland/meta-wayland-stage.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-stage.c b/src/wayland/meta-wayland-stage.c
index 6e16b14..c31d122 100644
--- a/src/wayland/meta-wayland-stage.c
+++ b/src/wayland/meta-wayland-stage.c
@@ -23,6 +23,7 @@
 
 #include "meta-wayland-stage.h"
 
+#include "display-private.h"
 #include "meta-cursor-tracker-private.h"
 
 G_DEFINE_TYPE (MetaWaylandStage, meta_wayland_stage, CLUTTER_TYPE_STAGE);