[PATCH v2] x86_64: roundeven with fpu and sse4.1 support

[Florian Weimer]

* Shen-Ta Hsieh:

> diff --git a/include/math.h b/include/math.h
> index a274f2bdfd..3639422b76 100644
> --- a/include/math.h
> +++ b/include/math.h
> @@ -38,7 +38,6 @@ libm_hidden_proto (__issignaling)
>  libm_hidden_proto (__issignalingf)
>  libm_hidden_proto (__exp)
>  libm_hidden_proto (__expf)
> -libm_hidden_proto (__roundeven)

I think this causes build failures on targets which uses the generic
roundeven in sysdeps/ieee754/dbl-64/s_roundeven.c (such as
powerp64le-linux-gnu).