Hardlink duplicated bytecode cache files by --hardlink-dupes instead of BRP script
    
    This is explained in https://discuss.python.org/t/3014
                     and https://github.com/fedora-python/compileall2/issues/16
    
    The %__brp_python_hardlink script already does this by Shell, this should be slightly faster.
    
    Also, this is more explicit.