[mutter] (4 commits) Non-fast-forward update to branch wip/carlosg/libmutter-dep-sources

[Robert Mader <rmader src gnome org>]

The branch 'wip/carlosg/libmutter-dep-sources' 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:

  9134411... build: Build libmutter using sources as positional argument
  b868f1c... build: Do not provide built sources as libmutter_dep source

Commits added to the branch:

  67cc60c... clutter: Align all screen transformations to 1/256th of a s (*)
  df228e8... screen-cast/area-src: Clear framebuffer before painting sta (*)
  f1b8639... build: Build libmutter using sources as positional argument
  304a3ed... build: Do not provide built sources as libmutter_dep source

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