[mutter] Non-fast-forward update to branch tintou/clutter-stage-paint

[Corentin Noël <corentinnoel src gnome org>]

The branch 'tintou/clutter-stage-paint' 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:

  794910f... clutter/stage: The data given to paint_to_buffer is not ino

Commits added to the branch:

  713e2f3... clutter/stage: Remove inout from paint_to_buffer