[arch-dev-public] Changes to x86_64 triplet

[Allan McRae]

Hi all,

gcc-6 decided to enforce the vendor part of the target triplet to be not
"unknown".  This means our vendor string is changed from "unknown" to
"pc", aligning with the i686 triplet.

I have release a new pacman with the triplet changed in pacman.conf:

CHOST="x86_64-pc-linux-gnu"

This _should_ have very little effect (the vendor string is quite
unimportant).

Allan