Do not hardcode directory names; get them from pkg-config
Similarly to the directory for systemd unit files (output of "pkg-config systemd --variable=systemdsystemunitdir"), the values of the "tmpfilesdir" and "sysusersdir" variables should not be hardcoded in debian/mandos.dirs and debian/mandos-client.dirs. Fix this the same way as with systemdsystemunitdir; i.e. remove the directories from the .dirs files, and instead create the directories in override rules in debian/rules.
* debian/mandos-client.dirs (usr/lib/sysusers.d): Removed. * debian/mandos.dirs (usr/lib/tmpfiles.d, usr/lib/sysusers.d): Removed. * debian/rules (override_dh_installdirs-indep): Also create directories for the "tmpfilesdir" and "sysusersdir" variables from pkg-config. (override_dh_installdirs-arch): New; create directory for the "sysusersdir" variable from pkg-config.