Log Message:
xf86-video-ati: update to 18.0.1.

I'm pleased to announce the 18.0.1 release of xf86-video-ati, the Xorg
driver for ATI/AMD Radeon GPUs supported by the radeon kernel driver.
This release supports xserver versions 1.13-1.19. It also works with
xserver 1.20 RC1, so unless something unexpected happens, it should work
with xserver 1.20 as well.

This is a bug-fix release addressing issues in 18.0.0. While those
issues shouldn't affect most users, I recommend that all users of 18.0.0
update to 18.0.1.

* The Xorg process could crash when multiple primary screens are
  configured in xorg.conf.
* TearFree could trigger debugging messages in the pixman library