meson-installed polkit fails to run with default usr/lib prefix

Merged Jan Rybar requested to merge jrybar/polkit:meson-prefix-usr into master

With default /usr/lib prefix set by meson, polkit service would fail with sigsegv. Changing prefix to /usr fixed the issue. Also /usr/lib conforms FHS more than /usr/local/lib in terms of a system service.

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