[gnome-photos] Update to latest libgd

[Debarshi Ray <debarshir src gnome org>]

commit aeb705fbd869e998e918619e9b13745e6d18c4c6
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Feb 17 18:11:21 2017 +0100

    Update to latest libgd
    
    Pick up some clean-ups.

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 7ead068..1bd7f34 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 7ead068e487ee2aee2cb1967be6bf9b0497f610a
+Subproject commit 1bd7f34a58f11f4bdebcbe5ca3371b89c6c2c83c