de-dupe LICENSE.LGPL2.1 in licenses
    
    The LICENSE.LGPL2.1 file is installed into the same systemd license
    directory for both the base systemd and -libs. Because the base
    systemd requires the -libs sub package it's a duplicate and will
    always be there, it shouldn't cause an issue but it seems in some
    cases the duplication into the same directory causes issues with
    ostree so remove it from the base systemd package as it will always
    be there due to the hard dep on the -libs subpackage.