Bug#175911: works with framebuffer device!

[Carsten Pfeiffer <carsten.pfeiffer@first.fraunhofer.de>]

I just upgraded to Xorg 7.0 in unstable and X still doesn't work without 
mga_hal.

Using the Option

Option	"UseFBDev"	"true"

however, makes it work! 

So as long as Matrox doesn't supply a new mga_hal that works with Xorg > 6.8.2 
and nobody fixes mga_drv, you can use fbdev to get an X session.