[gnome-continuous] manifest: Be sure we at least have one backend in PackageKit

[Javier Jardón Cabezas <jjardon src gnome org>]

commit c317da959d4b9cfe6dbfe6184c488f46a03375a6
Author: Javier Jardón <jjardon gnome org>
Date:   Tue Dec 22 15:25:40 2015 +0000

    manifest: Be sure we at least have one backend in PackageKit

 manifest.json |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index d71bfa6..8e03b92 100644
--- a/manifest.json
+++ b/manifest.json
@@ -788,6 +788,7 @@
                 "config-opts": ["--disable-strict",
                                 "--enable-NetworkManager",
                                 "--enable-systemd",
+                                "--enable-dummy",
                                 "--disable-man-pages",
                                 "--disable-bash-completion",
                                 "--disable-tests",