Stop :meth:`~platformdirs.PlatformDirs.iter_cache_dirs`, :meth:`~platformdirs.PlatformDirs.iter_state_dirs`,
:meth:`~platformdirs.PlatformDirs.iter_log_dirs` and :meth:`~platformdirs.PlatformDirs.iter_runtime_dirs` yielding the
same directory twice on Unix when use_site_for_root is active - :pr:`469` fixed this for the config and data
iterators only. On macOS, :meth:`~platformdirs.PlatformDirs.iter_cache_dirs` now yields the Homebrew and
/Library/Caches entries separately rather than one os.pathsep-joined string when multipath is set.