Bug#1023420: libvirt FTBFS: missing Build-Depends: mount

[Helmut Grohne]

Source: libvirt
Version: 8.5.0-1
Severity: serious
Tags: ftbfs

libvirt fails to build from source in unstable on a minimal chroot.
mount is no longer essential nor build-essential, so you must add it to
Build-Depends explicitly.

Helmut