native xorg on macppc

[Michael <macallan%netbsd.org@localhost>]

Hello,

at least on my dual G4 with an AGP Rage 128 native Xorg works now. It  
took a few minor hacks to get it going and for now it also needs  
'Option "UseFbDev" "false"' in the "Device" section but that can be  
dealt with ( like having that option turned off by default on non-x86  
or #ifdef the code out or something like that ).
It does not yet work on my G3 ( the mach64 driver misbehaves, I have a  
fix but that needs more testing )
Guess I'll commit all that tomorrow or later tonight after some cleanup.

have fun
Michael