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

[Dmitry Timoshkov]

Alexandre Julliard <julliard at winehq.org> wrote:

> > 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?
> 
> It's used to detect that xinput2 is not supported.

Apparently dinput shouldn't rely on this, but I don't see what to use
instead. How did it work before?

-- 
Dmitry.