[PATCH] xserver: add udev/systemd multi-seat support

[Dave Airlie]

>> >
>> > http://www.freedesktop.org/wiki/Software/systemd/multiseat

Hi Lennart,

this patch caused a build regression on our RHEL6 builder,

http://tinderbox.x.org/builds/2011-09-27-0006/logs/xserver/#build

Can you please provide a patch to fix the build against older udevs, and just
not do multi-seat in that case probably.

or else we'll have to revert this.

Dave.