Revert "Warn about uninstalled files"
Revert "Warn about uninstalled files"

Now that we're using debhelper compat 12, we get this
behavior without needing to opt into it.

This reverts commit 84269a295e7281df37acaea460ac42f83622b672.

Gbp-Dch: Ignore

agx/libvirt-debian,agx/libvirt-debian,agx/libvirt-debian,agx/libvirt-debian,agx/libvirt-debian