The stricter checks imposed by commit
ac39b313, while being valid in general,
require that media source attaches to media types the attributes that
application can request.

This patch exposes the MF_MT_VIDEO_ROTATION attribute, which is for
example requested by Legend of Keepers.
Signed-off-by: Giovanni Mascellani <gmascellani@codeweavers.com>
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>