[PATCH] s390x: Update math: redirect roundeven function

[Florian Weimer]

* Stefan Liebler via Libc-alpha:

> After recent commit
> 447954a206837b5f153869cfeeeab44631c3fac9
> "math: redirect roundeven function", building on
> s390x fails with:
> Error: symbol `__roundevenl' is already defined
>
> Similar to aarch64/riscv fix, this patch redirects target
> specific functions for s390x:
> commit 3213ed770cbc5821920d16caa93c85e92dd7b9f6
> "Update math: redirect roundeven function"

Please push this as the s390x maintainer.  Thanks. 8-)

Florian