* bpo-12639: msilib.Directory.start_component() fails if *keyfile* is not None (GH-13688)

msilib.Directory.start_component() was passing an extra argument to CAB.gen_id().
(cherry picked from commit c8d5bf6c3fa09b43f6a5ee779d493d251dbcc53c)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>