[mutter] Created tag 3.23.3

[Florian Müllner <fmuellner src gnome org>]

The signed tag '3.23.3' was created.

Tagger: Florian Müllner <fmuellner gnome org>
Date: Thu Dec 15 16:57:41 2016 +0100

    Tag release 3.23.3

Changes since the last tag '3.23.2':

Carlos Garnacho (1):
      wayland: Check surface outputs after mapped state changes

Florian Müllner (2):
      cogl: Do not include both GLES2 and GL headers
      Bump version to 3.23.3

Olivier Fourdan (2):
      wayland: disconnect mapped signal handler on destroy
      wayland: Preserve the event mask on the root window

Rui Matos (2):
      MetaRendererNative: Flush all pending swap notifies on idle
      wayland: Ensure we don't focus xdg_popups iff they're non-grabbing