client-info: Support cgroup v2
Currently flatak apps are incorrectly granted permission to use the location service without asking the user. This fixes it but then needs Librem5/phosh#524 (closed) to make this work under phosh.
Upstream-Reference: https://gitlab.freedesktop.org/geoclue/geoclue/-/merge_requests/81
Debian-Bug: #985345
Edited by Guido Gunther