[gimp] Non-fast-forward update to branch wip/Jehan/incremental-win-installer-improvements

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/incremental-win-installer-improvements' 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:

  e86ae69... build: move glib-networking modules into our custom glib pr

Commits added to the branch:

  4d3b453... build: move glib-networking modules into our custom glib pr