Mesa (master): softpipe: Fix cube face selection.

[Brian Paul]

Micha?? Kr??l wrote:
> Module: Mesa
> Branch: master
> Commit: de685b37a91bc95dd4093a44a49b7b47385b1f7c
> URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=de685b37a91bc95dd4093a44a49b7b47385b1f7c
> 
> Author: Michal Krol <michal at vmware.com>
> Date:   Fri Sep 18 14:36:59 2009 +0100
> 
> softpipe: Fix cube face selection.
> 
> If arx and ary are equal, we still want to choose from one of them,
> and not arz.

I'm cherry-picking this back to the 7.5 branch, Michal.

-Brian