[Yum] yum with x86-64

[seth vidal]

> FWIW, I've been talking a little with seth. One bad bug is squished
> (x86_64 would never be detected as the active architecture), and a
> little workaround makes sure it can install i386 packages as well.
> 
> Still to solve is packages existing in both package sets (i386 and
> x86_64) sometimes with a partially overlapping set of files.

Solving this one is on my short list.

I may ask you to test some changes to the arch handling in the
not-so-distant future.

-sv