[gnome-boxes] Update to latest libgd

[Alexander Larsson <alexl src gnome org>]

commit ccf791881b6a2e156ee87a53ab677ad2e200eff2
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue Jan 22 17:58:19 2013 -0500

    Update to latest libgd
    
    https://bugzilla.gnome.org/show_bug.cgi?id=692139

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 6318d52..3b110dd 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 6318d529754dbb2a5f95d3a546340f476b37bcc4
+Subproject commit 3b110dd27b65e5dc6591bfcbbf1799f549ce0d34