[mutter] (3 commits) Non-fast-forward update to branch wip/fmuellner/optional-logind

[Florian Müllner <fmuellner src gnome org>]

The branch 'wip/fmuellner/optional-logind' 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:

  ae5e654... build: Don't fail immediately when logind is missing

Commits added to the branch:

  52fdd24... wayland: avoid a crash in is_effectively_synchronized() (*)
  33c2a38... main: Fix typo (*)
  8256477... build: Don't fail immediately when logind is missing

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