[cairo] Updating cairo-demo/qcairo to current API

[Mauricio Piacentini]

>> +    m_surf = cairo_xlib_surface_create (dpy, drw,
>>+                DefaultVisual (dpy, DefaultScreen (dpy)), width(), height() );

> Why not pass (Visual*)x11Visual() as the visual?

Yes, good suggestion, since we are already using the Qt 
platform-specific wrappers.
Patch attached.

Regards,
Mauricio
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