[gnome-continuous] manifest: track branch v0.23 of libgit2

[Javier Jardón Cabezas <jjardon src gnome org>]

commit ccdbfd21e1c64600af6d0fa7498bde167b8c84a5
Author: Javier Jardón <jjardon gnome org>
Date:   Mon Jan 4 11:55:07 2016 +0000

    manifest: track branch v0.23 of libgit2

 manifest.json |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 2f0c17b..e57944c 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1287,6 +1287,8 @@
                 {"src": "gnome:gnome-maps"},
 
                {"src": "libgit2:libgit2",
+                "branch": "maint/v0.23",
+                "branch-reason": "master has API incompatible changes with libgit2-glib",
                 "patches": ["libssh-cmake-buildapi.patch"]},
 
                {"src": "gnome:libgit2-glib"},