[gnome-continuous] manifest: Add libxshmfence

[Jasper St. Pierre <jstpierre src gnome org>]

commit dafae0702030eacf08f88c3fa8300eba95f5d4da
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Apr 4 00:39:34 2014 -0400

    manifest: Add libxshmfence
    
    Hopefully this will fix the build issue.

 manifest.json |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 99ed330..5bb9975 100644
--- a/manifest.json
+++ b/manifest.json
@@ -272,6 +272,8 @@
 
                {"src": "fd:xorg/lib/libFS"},
 
+               {"src": "fd:xorg/lib/libxshmfence"},
+
                {"src": "fd-dbus:dbus",
                 "config-opts": ["--with-dbus-user=dbus",
                                 "--enable-inotify",