[gimp] Non-fast-forward update to branch wip/Jehan/win-native-builds-failing

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/win-native-builds-failing' 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:

  918b6bc... build: use older GObject Introspection for native Windows b

Commits added to the branch:

  2da70b3... build: CC="cache gcc" breaks gobject-introspection for nati