i486 base architecture

[Kyrre Ness Sjobak]

> The rpm implementation does not control what strings are used to 
> identify arch in packages.
> For example, PLD is using "pentium3", "pentium4", and "amd64" while
> Red Hat is using "i586", "i686" and "x86_64" with essentially the same
> meanings, and all of those strings are being carried in default rpm 
> configuration.

The pentium 3 is definatly a i686 arch... the p2 and pentium pro as
well...