[gnome-sdk-images] Bump freedesktop-sdk-images to new one with gstreamer 1.6

[Alexander Larsson <alexl src gnome org>]

commit 401326ed7e4c91003b31fa0e039898e62d0f2377
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Sep 28 09:34:13 2015 +0200

    Bump freedesktop-sdk-images to new one with gstreamer 1.6

 freedesktop-sdk-images |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/freedesktop-sdk-images b/freedesktop-sdk-images
index ae02628..71af8b3 160000
--- a/freedesktop-sdk-images
+++ b/freedesktop-sdk-images
@@ -1 +1 @@
-Subproject commit ae02628ca4ac62568568fc9bc50c1f2393608045
+Subproject commit 71af8b311f2499632e0f02247093f45b97417303