semi-working X11 patches for cats

Hi,

I've recently been fidling with patches to get X working on cats.  I've
attached my current diff against current X.  You'll need to add 
USE_XF86_4=YES
to your mk.conf.

Note that some of the patch is rather icky in places, but it almost
works.  I've not figured out why the keyboard doesn't work yet, or why
there's screen corruption, I'm wondering about the SA having a writeback
cache has some bearing on the screen corruption.  I'm also not sure
about the console defines I'm using, if one of them is confusing the
build.

Note that if anyone does try it they'll need remote access to kill the X
server.  Basically I wanted to show progress, and allow others to have a
fiddle 8)

Note that you need a recent xsrc with 1.6.x or 1.6 -current for the
/dev/pci interfaces (you may need to run MAKEDEV pci0 in /dev

Chris