Revert "Merge branch 'pwithnall/polkit-51-usr-local-share-is-my-homeboy' into 'master'"

This reverts merge request !75 (merged)
It was foolishly merged before CI pipeline finished.
The tests are failing (org.company.order1 is wrong) and rules_file_name_cmp() needs fixes to reflect /usr/local/share (org.company.order2 probably prefers wrong .rules file)

NOTE: Glib testing framework is a tremendous pain in terms of verbose test output. This needs some future rewrites.