[gnome-boxes] Update to latest libgd

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit ef09385e88b0605a6c8e5418faa3e1bdd8398b85
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Mon Apr 15 20:02:59 2013 +0300

    Update to latest libgd
    
    https://bugzilla.gnome.org/show_bug.cgi?id=698053

 libgd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgd b/libgd
index 7d2b7b4..2fb32d9 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 7d2b7b43773586f20bd7d76d74e96012b6a82fe5
+Subproject commit 2fb32d9f7adf17e497340fb91d444caa741e4ce2