[patch] fix OPTIONS_DEFAULT_SPEC for i386

[Eric Christopher]

> So, the choices are:
> 
> a) reorder the specs (what the patch does)
> b) depend tune and cpu only on tune and cpu, not arch.
> 
> OK? Choice b? Some choice I haven't noticed?
> 

As a followup btw, I think that choice b) is more obviously correct.

-eric