[gnome-photos/wip/rishi/thumbnailer: 7/7] Update to latest libgd

[Debarshi Ray <debarshir src gnome org>]

commit f2b59bff5fcaa91832b027bd6b1d6a122e429c6b
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.
    
    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..42013aa 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 1bd7f34a58f11f4bdebcbe5ca3371b89c6c2c83c
+Subproject commit 42013aabe689aa438d304b28fbb795c0d61103d8