[PATCH] powerpc: Fix feraiseexcept and feclearexcept macros

[Florian Weimer]

* Matheus Castanho:

>> __builtin_popcount (e) == 1 does not
>> seem to be unreasonable to express this condition.
>> 
>
> Adhemerval and Florian, apart from the discussion to remove or not
> fenvinline.h altogether, could we push this commit? This header is
> currently in a broken state and I'd like to fix it for the time being.

I think the patch is okay, but please also wait for Adhemerval's
comments.

I'd also be okay with powerof2 and a zero check.  I agree that we should
fix this soon.

Thanks,
Florian