[Yum] Determining best arch in HeaderInfoNevralLoad

[seth vidal]

> OK, the determination of which arch to use cannot be made until we are
> knowledgeable about the arch of a existing package in the rpmdb?
> 
> 
> I assume there are cases where a less optimized compile runs better on a
> given system?
> 

There is also the problem that determining them there is kinda fruitless
- that's the best place to just evaluate the package lists to see what
headers we need.

This is kinda moot, of course b/c this part is disappearing.

Have you looked at yum-HEAD/rpmUtils/updates.py and arch.py?

That's where the new arch stuff is and I think the biarch support there
is A LOT more exacting.

-sv