[gimp] (9 commits) Non-fast-forward update to branch wip/Jehan/native-win64-build

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/native-win64-build' 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:

  3361b18... gitlab-ci, build: testing native Windows build.
  2c9e183... Cleanup the Gitlab runner manually.
  97e29fa... build: do not build Windows dependencies with ccache.
  53d12a0... build: move the prefix directory to the build dir.
  47559a6... build, gitlab-ci: break the native Windows build into 2 job
  22d8867... build: fix a weird (yet unexplained) build bug.
  d5f9546... build: clean up a bit the dependencies.
  e9a185b... build: pkg-config unneeded.
  5cdde67... Add back gtk-doc.

Commits added to the branch:

  644abd7... Update Vietnamese translation (*)
  fca3f23... Update Vietnamese translation (*)
  8fdeadd... plug-ins: fix using wrong offset for group layer masks in p (*)
  6c1a0e8... app: gui_free_progress() should accept any GimpProcess widg (*)
  833ce48... gitlab-ci, build: testing native Windows build.
  a2bf3be... Cleanup the Gitlab runner manually.
  853b301... build: do not build Windows dependencies with ccache.
  42ef8c0... build, gitlab-ci: break the native Windows build into 2 job
  e9eba90... build: fix a weird (yet unexplained) build bug.

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