[gnome-photos] Update to latest libgd

[Debarshi Ray <debarshir src gnome org>]

commit 2b9bf90374cb2055b5a1b4e35dec12b971413ce3
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 97a852c..eaef0ee 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 97a852cdf3d37776f9c98f730d7dcbbe995bdeb7
+Subproject commit eaef0ee3c2da2aa9b37f7a4ad0ffd5b2d1cae900