[Nouveau] preliminary nv50 wfb patch

[Maarten Maathuis]

This patch will only work with Option "EXAPixmaps" "1", and will
prevent classic exa from working.

Occasionally a pixmap fails to map, but that's not related to this patch.

I haven't done any hardcore optimisations, but suggestions are
ofcource appreciated.

In my experience some benchmarks suck now (gtkperf for which had it's
performance halved), and qt4 is definitely faster than gtk (gtk has
some odd rendering scenarios).

This is by no means finished, but i wanted to share what i have.

Maarten.
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