[gnome-photos/wip/rishi/thumbnailer: 5/10] Update to latest libgd

[Debarshi Ray <debarshir src gnome org>]

commit 9448fc5bc8ab355f141a70019962e879413baf01
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Feb 21 13:49:35 2017 +0100

    Update to latest libgd
    
    GdMainIconBoxChild now expands the thumbnail as the GtkFlowBox is
    resized. The "content-tile" style class has been renamed as "tile".
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777869

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 1bd7f34..cf4e8b7 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 1bd7f34a58f11f4bdebcbe5ca3371b89c6c2c83c
+Subproject commit cf4e8b752a916205b9f2d9e75fc0973e61aeb947