[mutter] (26 commits) Non-fast-forward update to branch wip/carlosg/xwayland-startup-side-channel

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/xwayland-startup-side-channel' 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:

  85e775b... tests: Ensure MetaX11Display is initialized before running 
  132ef07... core: Make meta_display_init_x11() an async function
  ac8c697... xwayland: Do not block on Xwayland initialization
  81da5cb... tests: Set fatal log handler on clutter tests
  eb82f54... core: Use DISPLAY envvar to forward in the launch context
  bb26883... wayland: Set up initialization X11 socket
  d8f48e6... wayland: Pass private X connection on GNOME_SETUP_DISPLAY
  b8120fb... xwayland: Allow setting up maintenance processes

Commits added to the branch:

  d992722... cogl: correct check for COGL_OFFSCREEN_DISABLE_DEPTH_AND_ST (*)
  d48fec8... cogl: drop extraneous parentheses (*)
  d3afe43... test: use correct enum (*)
  c039764... clutter: Remove unused deprecated/clutter-keysyms.h (*)
  6da568e... clutter: Remove unused deprecated/clutter-stage-manager.h (*)
  375d35b... clutter: Remove unused deprecated/clutter-animatable.h (*)
  0a41f0f... clutter: Remove unused deprecated/clutter-bin-layout.h (*)
  3e9f847... clutter: Remove unused deprecated clutter_container_{add,re (*)
  c74f4f6... clutter: Remove some unused deprecated clutter_table_layout (*)
  24b38a5... clutter: Remove some unused deprecated clutter_animation AP (*)
  293ec0a... clutter: Remove some unused deprecated clutter_state API (*)
  c4d1e15... clutter: Remove some unused deprecated clutter_alpha API (*)
  289e24f... clutter: Remove some unused deprecated clutter_actor API (*)
  7adaaab... clutter: Remove deprecated ClutterTableLayout (*)
  46b3811... wayland: Drop unused wl_signal structs (*)
  e7b2f96... wayland: Avoid redundant cancel() call (*)
  48639ac... wayland: Do not cancel data source on offer destruction (*)
  e5af790... wayland: Move "ownership" of the DnD selection source to th (*)
  3793560... tests: Ensure MetaX11Display is initialized before running  (*)
  03404c0... tests: Set fatal log handler on clutter tests (*)
  120f029... core: Make meta_display_init_x11() an async function (*)
  6afb77c... xwayland: Do not block on Xwayland initialization (*)
  3f0e3e4... core: Use DISPLAY envvar to forward in the launch context
  19292d3... wayland: Set up initialization X11 socket
  7a588b3... wayland: Pass private X connection on GNOME_SETUP_DISPLAY
  3ca9a40... xwayland: Allow setting up maintenance processes

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