Excise xcb-drmHEADmaster

The experiment was at best a pyrrhic victory. Whilst it did show that
you could successfully subvert cairo_xcb_surface_t and provide the
rendering locally faster (than the xlib driver at that time), any
performance benefits were lost in the synchronisation overheads and
server-side buffer allocation.

Once cairo-gl is mature, we need to look at how we can overcome these to
improve client-side rendering

In the meantime, cairo-xcb is no longer my playground for
experimentation and is shaping up to become a stable backend...

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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