[1/3] winex11: Select for XRandR screen change events and implement an event handler.

[Sam Edwards]

This patch adds an event handler to xrandr.c to process 
RRScreenChangeNotify events, so that when non-Wine applications change 
the display resolution, Wine can find out about it.

Two main discussion points:

- Previously, there was nothing pulling events out of gdi_display's 
queue, thus necessitating the need for a new event handler. I opted to 
put it in xrandr.c since this handler only manages XRandR events, but it 
might be cleaner to move it over to event.c.

- Are we okay with having to call the event handler, or would this work 
better in a continuously-running background thread instead?
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