[gnome-boxes] Update to latest libgd to get working notification header

[Alexander Larsson <alexl src gnome org>]

commit e3c4929d594ee6eef6aba002cbe79034eec95c26
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Oct 29 16:31:12 2012 +0100

    Update to latest libgd to get working notification header
    
    https://bugzilla.gnome.org/show_bug.cgi?id=679106

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 516d258..43134a3 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 516d2582a87bc72672d3c1d3a5a4d37a8aa7df3f
+Subproject commit 43134a3534f0468a7de992e11e236989a7c86357