Bug#1021468: gtk3-client built for no reason (gtk3.22-client packaged instead)

[Marko Lindqvist]

Package: freeciv
Version: 3.0.3-3

debian/rules: "--enable-client=gtk3,gtk3.22,sdl2,qt"

Nothing from gtk3-client is packaged in Debian, so there should be no need
to build it.


 - ML