quodlibet fails to build after python 3.10 update

[Remco van 't Veer]

Hi,

Forgotten patch:

  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63205#11

The supplied patch by Alice works and looks good to me.  Can somebody
please have a look and consider committing it?

Thanks!

Cheers,
Remco