[mutter] (11 commits) Non-fast-forward update to branch wip/carlosg/volatile-warnings

[Marge Bot <marge-bot src gnome org>]

The branch 'wip/carlosg/volatile-warnings' 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:

  f208127... cogl: Drop "volatile" from static GTypes in manual registra
  d609761... clutter: Drop "volatile" from static GTypes in manual regis
  05fe8ee... core: Drop "volatile" from static GTypes in manual registra

Commits added to the branch:

  7b5e855... xwayland: Use defines for X11 directory and path (*)
  1f1bf4c... xwayland: Check permissions on /tmp/.X11-unix (*)
  374a811... Update Serbian translation (*)
  561ef38... Update Galician translation (*)
  21a09fb... Tag release 40.0 (*)
  4a5b983... Post-release version bump (*)
  9e36ff2... Update British English translation (*)
  3b70288... Update Vietnamese translation (*)
  9e10d2f... cogl: Drop "volatile" from static GTypes in manual registra
  bc1026d... clutter: Drop "volatile" from static GTypes in manual regis
  dc94819... core: Drop "volatile" from static GTypes in manual registra

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