[gtk+] Add a missing include

[Matthias Clasen <matthiasc src gnome org>]

commit 190c27198603028bfcbc02f1648b8504827663de
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Nov 9 22:03:10 2011 -0500

    Add a missing include

 gtk/gtkapplication.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkapplication.c b/gtk/gtkapplication.c
index f0bba43..377f104 100644
--- a/gtk/gtkapplication.c
+++ b/gtk/gtkapplication.c
@@ -29,6 +29,7 @@
 
 #include "gtkapplication.h"
 #include "gtkmarshalers.h"
+#include "gtkmain.h"
 #include "gtkwindow.h"
 
 #include <gdk/gdk.h>