[totem] libgd: Update to latest version

[Bastien Nocera <hadess src gnome org>]

commit d1561b77ff9376f5e56ef9b0f6040c0f7bc02c26
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Sep 18 12:01:42 2015 +0200

    libgd: Update to latest version
    
    This fixes rendering bugs in the tagged entry we use.

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 7e0dd4b..ed6c8f3 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 7e0dd4b15ea80673f62249ac092763b10fc226ad
+Subproject commit ed6c8f3667b67ac284933a3d03faa34b5948bf52