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gcr_4: add systemdSupport option
Since 7f2a6f17 ("xdg-desktop-portal-gtk: Enable all default portals unconditionally"), building gcr_4 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 "systemdSupport" for consistency with gcr (3)'s equivalent option.