enable n32 and n64, and move o32 into mips/mips32

[Roland McGrath]

> Err...  You're turning the declarations that used to be of
> ``automatic'' (i.e., nested) functions into static declarations.  Did
> you really mean to do that?

Nested in what?  The definitions are at top level.  The `auto' didn't make
sense to me.  static is the storage class in those functions' definitions.
Using `auto' this way triggered a compiler bug, but `static' worked (and
makes sense, which `auto' does not).

> The patch seems to do the right thing for me as well.  Will you please
> put it in, or should I?

I'd like a comment from Jakub to be sure the compiler is ok with it.