[gcr] (3 commits) Non-fast-forward update to branch wip/nielsdg/no-allow-none

[Niels De Graef <nielsdg src gnome org>]

The branch 'wip/nielsdg/no-allow-none' 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:

  a5cedfe... Don't use deprecated (allow-none) GIR annotation
  ab57944... Mark GIR constants as such

Commits added to the branch:

  259080e... gck: Avoid unaligned memory access (*)
  f7ad66e... Don't use deprecated (allow-none) GIR annotation
  988127e... Mark GIR constants as such

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