This commit basically reverts b22ff801.

Windows does not do that, but our current implementation of winex11
requires periodic event polling to forward events to the wineserver.
Signed-off-by: Sebastian Lackner <sebastian@fds-team.de>
Signed-off-by: Michael Müller <michael@fds-team.de>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>