[PATCH] benchtests: Run _Float128 tests only on architectures that support it

[Florian Weimer]

* Paul Zimmermann:

> * I wonder why you also patch configure, isn't this file automatically
>   generated?

It's checked into the repository, so it shows up in the diff.

> * finally "find . -type f -exec grep \-l __float128 {} \;" finds several other
>   instances of __float128 (sysdeps/x86_64/fpu/math-tests-snan.h for example).
>   Should some of those be changed to _Float128 too?

I think it's mostly comments or architecture-specific code.  For x86, we
know that __float128 exists, so that's not actually a problem.

Thanks,
Florian
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