[mutter] (9 commits) Non-fast-forward update to branch bilelmoussaoui/untangle-window

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

The branch 'bilelmoussaoui/untangle-window' 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:

  578e982... meson: Split x11 option into backend/xwayland
  33730a8... cogl: Fix build without X11
  d104da3... cogl: Unify HAS_X11/HAS_XLIB build configs
  c5577a1... build: Make GLX dependent on X11
  04cde68... build: Add X11/XWayland config options
  a19843f... core: Untangle meta_window_shared_new
  06715a6... window: Move surface property to it subclasses

Commits added to the branch:

  11bc19f... wayland: Drop xdg-shell v6 protocol (*)
  d4bdd8b... wayland: Remove Gtk primary selection protocol (*)
  d84922e... meson: Split x11 option into backend/xwayland
  02d0153... cogl: Fix build without X11
  a0f2388... cogl: Unify HAS_X11/HAS_XLIB build configs
  692a31b... build: Make GLX dependent on X11
  9c14cb7... build: Add X11/XWayland config options
  4ffa372... core: Untangle meta_window_shared_new
  7b0b712... window: Move surface property to it subclasses

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