stripping off "xf86-*-" from drivers

[David Miller]

From: Julien Cristau <jcristau at debian.org>
Date: Sun, 20 Jan 2008 14:08:50 +0100

> In the case of the sun drivers, the same breakage could have happened
> with a monolithic tree, because changes wouldn't have been build-tested
> on sparc anyway.

That's really besides the point.  And in this particular case
drivers (sparc or not) have to choose between the old and new
way of doing GC privates and such.