Bug 1198173 - Intermittent failures trying to clone tooltool. r=dustin

testing/taskcluster/tasks/build.yml

@@ -52,7 +52,7 @@ task:
       GECKO_HEAD_REPOSITORY: '{{head_repository}}'
       GECKO_HEAD_REV: '{{head_rev}}'
       GECKO_HEAD_REF: '{{head_ref}}'
-      TOOLTOOL_REPO: 'https://github.com/mozilla/build-tooltool'
+      TOOLTOOL_REPO: 'https://git.mozilla.org/build/tooltool.git'
       TOOLTOOL_REV: 'master'
 
   extra: