[totem] libgd: Update libgd to fix check boxes appearance

[Bastien Nocera <hadess src gnome org>]

commit 6ec6478f10959992fa290388022019272d770a78
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Sep 3 14:12:36 2014 +0200

    libgd: Update libgd to fix check boxes appearance
    
    Check boxes would appear as empty when toggled on in the main view.

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 6bca681..8768635 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 6bca681f549714171110e0b4ffa1f505627b348e
+Subproject commit 8768635251d9c3e11f00fb4e355b2c9ba4d4f48a