Add polkitd to CI build

Merged Gaël Bonithon requested to merge Tamaranch/xfce4-dev-tools:add-polkitd-to-ci into master

For gettext migration of project containing a policykit file.

See also for a similar issue where it doesn't seem possible to require the right package at configure time to ensure the presence of a certain .its file (here we need polkit.its).

Edited by Gaël Bonithon

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