Bug#967263: aumix: depends on deprecated GTK 2

[Bastian Germann]

On Tue, 4 Aug 2020 12:46:59 +0200 Samuel Thibault wrote:

I had mailed tre...@jpj.net about it in april, without any answer so
far. I guess we'll just disable the gtk build.

I have disabled the gtk build in the git repo.