[gnome-control-center] Use latest libgd

[Cosimo Cecchi <cosimoc src gnome org>]

commit 7ec1a1eb75ae4a2a21d0ab29f942772cddc7a94f
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue Mar 19 11:40:05 2013 -0400

    Use latest libgd

 libgd             |    2 +-
 shell/cc-window.c |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 8c3d777..3abc95d 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 8c3d777e1d18974d16d2ea0bdc13ad47f2f95da0
+Subproject commit 3abc95da3c5b44484aeae3c69e3701da160bf057
diff --git a/shell/cc-window.c b/shell/cc-window.c
index b184ebf..3f26fe2 100644
--- a/shell/cc-window.c
+++ b/shell/cc-window.c
@@ -1439,6 +1439,7 @@ create_window (CcWindow *self)
 
   priv->stack = gd_stack_new ();
   gd_stack_set_homogeneous (GD_STACK (priv->stack), TRUE);
+  gd_stack_set_transition_type (GD_STACK (priv->stack), GD_STACK_TRANSITION_TYPE_CROSSFADE);
   gtk_box_pack_start (GTK_BOX (box), priv->stack, TRUE, TRUE, 0);
 
   create_main_page (self);