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upower: add withSystemd option
Since 7f2a6f17 ("xdg-desktop-portal-gtk: Enable all default portals unconditionally"), building upower is necessary to build xdg-desktop-portal-gtk, but it wasn't possible for systems that can't use systemd. I've called the option "withSystemd" as it's the most common name for this kind of option in Nixpkgs, and it's consistent with the package's "withIntrospection" argument (though not "useIMobileDevice").