[gimp] Non-fast-forward update to branch wip/Jehan/distribute-meson-tarball

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/distribute-meson-tarball' 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:

  61fcced... libgimp: don't run defcheck.py on Windows.
  00348c2... Just a test for the CI. DON'T PUSH!

Commits added to the branch:

  4ffb9c7... libgimp: don't run defcheck.py on Windows.