Driver transition: via -> openchrome

[Adam Jackson]

Just a heads-up:

The via driver in Xorg is pretty much dead.  Therefore, rawhide will be
switching to openchrome.  xorg-x11-drivers now Requires openchrome on
x86 and amd64 machines, and the openchrome package (once it builds
again) will both provide and obsolete the via package, and munge your
config file (if present) to change the driver name appropriately.  Also,
X will load the new driver if started without a config file.

Shouldn't break anything, but if it does, as always, bugzilla is
standing by and ready to take your call.

- ajax