* Meson >=0.41.0, (unreleased) polkit 0.114+ don't use data_dirs argument
* Meson >=0.41.0, older polkit, use local ITS rules with data_dirs argument
* Meson <0.41.0, any polkit, use custom policy building rules
Later on when meson 0.41.0+ and polkit 0.114+ is in many stable distros
this commit can be reverted and dependencies updated.
Fixes: #107
