[gnome-sdk-images] Build yelp from git

[Alexander Larsson <alexl src gnome org>]

commit 77d99aa4081ae7e33fd3bbe8e0a43ef7f9f7f6b5
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Mar 17 11:02:41 2017 +0100

    Build yelp from git

 org.gnome.Sdk.json.in |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index cf1a753..e6cb58a 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -780,9 +780,8 @@
             "name": "yelp",
             "sources": [
                 {
-                    "type": "archive",
-                    "url": "https://download.gnome.org/sources/yelp/3.22/yelp-3.22.0.tar.xz";,
-                    "sha256": "8616b77c239aaa731312609f192c9b2c71d54b2cae42ff23efa23b5b3188778e"
+                    "type": "git",
+                    "url": "git://git.gnome.org/yelp"
                 },
                 {
                     "type": "patch",