[gnome-panel/gtk3] Don't include gdkconfig.h

[Germán Poó Caamaño <gpoo src gnome org>]

commit cdeb367f196ddaa59fb2516404e7c4f951b31312
Author: Milan Bouchet-Valat <nalimilan club fr>
Date:   Wed Dec 29 22:32:25 2010 +0100

    Don't include gdkconfig.h
    
    No need to include it directly, and it makes the build fail.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=627455

 applets/notification_area/na-tray-manager.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/applets/notification_area/na-tray-manager.c b/applets/notification_area/na-tray-manager.c
index b5a11fd..8c3c060 100644
--- a/applets/notification_area/na-tray-manager.c
+++ b/applets/notification_area/na-tray-manager.c
@@ -26,7 +26,6 @@
 
 #include "na-tray-manager.h"
 
-#include <gdkconfig.h>
 #include <glib/gi18n.h>
 #if defined (GDK_WINDOWING_X11)
 #include <gdk/gdkx.h>