[mutter] (14 commits) Non-fast-forward update to branch wip/nielsdg/use-g-declare-interface

[Niels De Graef <nielsdg src gnome org>]

The branch 'wip/nielsdg/use-g-declare-interface' 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:

  704b8ac... clutter: StageWindow: use G_DECLARE_INTERFACE()
  74d1897... clutter: Content: use G_DECLARE_INTERFACE()
  f02d955... clutter: MasterClock: use G_DECLARE_INTERFACE()

Commits added to the branch:

  956ab4b... build: Make libcanberra no longer optional (*)
  12f8325... core: Add MetaSoundPlayer abstraction (*)
  8715f74... core: Make MetaBell use MetaSoundPlayer to play the bell so (*)
  ebfc618... workspace: Port to MetaSoundPlayer (*)
  3693f6f... build: Use plain libcanberra instead of libcanberra-gtk3 (*)
  d360b25... build: Install .pc files in correct location (*)
  f740e8e... core: Fix compiler warning in MetaSoundPlayer (*)
  582b67a... window: Handle maximize when headless (*)
  763ae36... Drop Autotools (*)
  5eb749d... project: Update gitignore (*)
  fb38738... Remove obsolete .cvsignore files (*)
  084a77c... clutter: StageWindow: Use G_DECLARE_INTERFACE()
  6fd3fb5... clutter: Content: Use G_DECLARE_INTERFACE()
  75f9d67... clutter: MasterClock: Use G_DECLARE_INTERFACE()

(*) This commit already existed in another branch; no separate mail sent