[gnome-photos] Update to latest libgd

[Debarshi Ray <debarshir src gnome org>]

commit 0635b82d7f30aaebbe93ac7129d7638041e7365a
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Feb 22 12:44:17 2016 +0100

    Update to latest libgd
    
    Ensure that the GdTaggedEntryTag is not higher than the entry.

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index 7c12355..a0717ad 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit 7c1235591c4aa866b28c8b8dabdcb3b9084c5763
+Subproject commit a0717ad8c078c07ea9d10aed385d30198fd24b03