[mutter] Fix compiler warnings

[Adel Gadllah <agadllah src gnome org>]

commit a2a31883319b941dc7268f32372db50b0cdb11fa
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Fri Feb 8 00:20:03 2013 +0100

    Fix compiler warnings

 src/core/screen.c |    1 +
 src/core/window.c |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/core/screen.c b/src/core/screen.c
index 73d7173..8ee4470 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -40,6 +40,7 @@
 #include "xprops.h"
 #include <meta/compositor.h>
 #include "mutter-enum-types.h"
+#include "core.h"
 
 #include <X11/extensions/Xinerama.h>
 
diff --git a/src/core/window.c b/src/core/window.c
index e669fa7..9a2944d 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -44,6 +44,7 @@
 #include "window-props.h"
 #include "constraints.h"
 #include "mutter-enum-types.h"
+#include "core.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlibint.h> /* For display->resource_mask */