PCI rework

[Ian Romanick]

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I've just posted my first set of patches for my PCI rework.  Right now
this just patches the core server and the MGA driver.  These patches
require that libpciaccess be built and installed like all the other X libs.

http://users.freedesktop.org/~idr/pci_cleanup/

The MGA driver currently just blanks the screen when UseFBDev is not
used.  I had hoped to track that issue down before posting these
patches, but I've been busy putting out other fires.

I'm trying to understand how all of "resource" stuff works and how much
more of it I can gut.  It seems like most of it can go.  The only
resources that we should have to track and deal with conflicts is ISA,
right?

The other issue is determining which release this will eventually
target.  7.2?  8.0?  7.1 is obviously right out. :)
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