[mutter] (3 commits) Non-fast-forward update to branch wip/nielsdg/remove-unused-gpu-function

[Jonas Ådahl <jadahl src gnome org>]

The branch 'wip/nielsdg/remove-unused-gpu-function' 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:

  039dbdc... gpu: Remove unimplemented ::get_kms_file_path()

Commits added to the branch:

  f3dd97e... README: Add contribution section (*)
  b70c0eb... gitlab-ci.yml: Add check for issue or MR URL (*)
  e089375... gpu: Remove unimplemented ::get_kms_file_path()

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