[arch-dev-public] -ARCH package extension

[Paul Mattal]

Since pacman 3, makepkg builds:

  foo-2.9-1-i686.pkg.tar.gz

instead of the old

  foo-2.9-1.pkg.tar.gz

What is our migration path for using that in all the repos? More
specifically:

* How do we tell pacman to start using the new syntax when looking
for packages? Do we need to, or do the repo db files take care of that?

* How do we synchronize the update of devtools and aurtools?

* How do we control/manage the propagating all that via mirrors,
since all the filenames will change and each mirror will essentially
want to do a full re-download?

* Do we announce some time for a flashover and tell devs not to
update packages during that time?

Maybe someone's already figure this all out, but it would be nice to
know how this is going to be handled so we can decide what to do to
plan ahead.

- P