[gimp] Non-fast-forward update to branch wip/Jehan/fix-native-win-build

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/fix-native-win-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:

  6b3a2ce... icons: test?
  0c16fe0... icons: test again.

Commits added to the branch:

  4004560... icons: fix the native Windows build in CI with autotools.