Both seem to be able to handle either kind of interface on Windows.

f72f8e5c was not enough, since the IDispatch proxy/stub factory
delegates to the typelib proxy/stub factory if the IID is not
IDispatch.
Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>