[mutter] (5 commits) Non-fast-forward update to branch bilelmoussaoui/without-xwayland

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

The branch 'bilelmoussaoui/without-xwayland' 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:

  e6e0101... build: Allow disabling xwayland
  83c4201... CI: Disable xwayland when wayland is disabled
  d1b2925... ci: Add a Xwayland-less target

Commits added to the branch:

  c142e02... build: Allow disabling xwayland
  573347e... ci: Disable xwayland when wayland is disabled
  7af4902... wayland: Add a prepare-shutdown signal
  fb9a757... wayland: Move Xwayland specific call to xwayland
  c6831b3... ci: Add a Wayland only target