[AD] DGA2 module

[Peter Wang <tjaden@xxxxxxxxxx>]

This patch (which will probably only apply against a really recent
CVS copy) will build the DGA2 graphics driver as a module if
possible.  I'll probably commit it fairly soon.

  http://www.alphalink.com.au/~tjaden/dev/dga2module.diff.gz
  http://www.alphalink.com.au/~tjaden/dev/xdga2s.s  (new file)

I had to add a new driver list function which adds a driver to the
front of a driver list.  Otherwise the normal X11 windowed driver
would be autodetected ahead of the DGA2 driver.  Maybe there is a
better way?
  
-- 
tjaden@xxxxxxxxxx - http://www.alphalink.com.au/~tjaden/
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