[zenity] allow build if GDK_WINDOWING_X11 not set

[Arx Henrique Pereira da Cruz <arxcruz src gnome org>]

commit 5c9095731e7995974de2468debbf1b82593445fd
Author: Jason Penney <jc_zorkmid yahoo com>
Date:   Thu Oct 30 06:09:59 2014 -0400

    allow build if GDK_WINDOWING_X11 not set

 src/util.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/util.h b/src/util.h
index f9db4be..ada73b1 100644
--- a/src/util.h
+++ b/src/util.h
@@ -6,6 +6,8 @@
 
 #ifdef GDK_WINDOWING_X11
 #include <gdk/gdkx.h>
+#else
+typedef gint Window;
 #endif
 
 G_BEGIN_DECLS