[gnome-continuous] manifest: add libseccomp (required for xdg-app)

[Vadim Rutkovsky <vrutkovsky src gnome org>]

commit a1d73e547488e46ada2be61d6b5cecb14cd0da31
Author: Vadim Rutkovsky <vrutkovs redhat com>
Date:   Tue Jun 2 11:29:16 2015 +0200

    manifest: add libseccomp (required for xdg-app)

 manifest.json |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 909c030..922f6ab 100644
--- a/manifest.json
+++ b/manifest.json
@@ -874,6 +874,8 @@
                                 "--with-dracut",
                                 "--enable-installed-tests"]},
 
+               {"src": "git:git://github.com/seccomp/libseccomp"},
+
                 {"src": "git:git://github.com/alexlarsson/xdg-app",
                  "config-opts": ["--disable-documentation",
                                  "--with-priv-mode=none"],