winex11.drv: Do not trash existing clip rectangle if XInput2 is not available.

[Dmitry Timoshkov]

Alexandre Julliard <julliard at winehq.org> wrote:

> > This patch makes dlls/user32/input.c and dlls/user32/monitor.c tests pass
> > on a system without XInput2.
> 
> It will break dinput, we rely on the clip rectangle being reset.

Is that a way how dinput detects xinput2 support? Or is that a general
approach to detect if a driver supports mouse clipping? How did it work
before?

-- 
Dmitry.