Bug#967232: xscreensaver: Unversioned Python removal in sid/bullseye

[Tormod Volden]

I think this is solely through the build dependency on libglade2-dev
so this will be solved by xscreensaver getting rid of this dependency
(bug #967892) or by libglade2 getting rid of its python dependency
(bug #895517):
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895517#14