[gnome-sdk-images] Switch to official upstream freedesktop-sdk-images repo

[Alexander Larsson <alexl src gnome org>]

commit 5e75781bdad348a090fe056cece3fcb5cd87e9ae
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Sep 16 11:47:28 2015 +0200

    Switch to official upstream freedesktop-sdk-images repo

 .gitmodules |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.gitmodules b/.gitmodules
index 6a7aab0..b1c494e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "freedesktop-sdk-images"]
        path = freedesktop-sdk-images
-       url = https://github.com/alexlarsson/freedesktop-sdk-images.git
+       url = git://anongit.freedesktop.org/xdg-app/freedesktop-sdk-images