winemac: Defer ordering a window out if it's in the process of entering or exiting Cocoa full-screen mode.

Cocoa doesn't handle the window being ordered out or closed during the
animation well and leaves a ghost window around.
Signed-off-by: Ken Thomases <ken@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>