[mutter] (3 commits) Non-fast-forward update to branch wip/chergert/has-accessible

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/has-accessible' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  400e61d... clutter: avoid g_signal_emit_by_name() from ClutterActor
  8030117... clutter: add clutter_actor_has_accessible()
  71f8054... cally: avoid creating accessible during actor removal

Commits added to the branch:

  3db07e2... clutter: avoid g_signal_emit_by_name() from ClutterActor
  2d7eea0... clutter: add clutter_actor_has_accessible()
  097df7e... cally: avoid creating accessible during actor removal