[gnome-continuous] manifest: Work around corrupted dri2proto git repo

[Colin Walters <walters src gnome org>]

commit 1ca6853eac677782d53b352593a1c5715a7ea1f9
Author: Colin Walters <walters verbum org>
Date:   Thu Dec 10 12:24:49 2015 -0500

    manifest: Work around corrupted dri2proto git repo

 manifest.json |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index d653c4a..f1c4676 100644
--- a/manifest.json
+++ b/manifest.json
@@ -165,6 +165,8 @@
                 "component": "devel"},
 
                {"src": "fd:xorg/proto/dri2proto",
+                "branch": "refs/heads/master",
+                "branch-comment": "dri2proto has a refs/master which is ambiguous; discussed on #xorg-devel 
irc with ajax, no fix yet",
                 "component": "devel"},
 
                {"src": "fd:xorg/proto/dri3proto",