Remove powerpc32 sqrt wrappers

[Gabriel F. T. Gomes]

On Thu, 24 Aug 2017 14:23:36 +0000
Joseph Myers <joseph@codesourcery.com> wrote:

>Would any powerpc people like to comment on this patch 
><https://sourceware.org/ml/libc-alpha/2017-08/msg01028.html>?

I had never ran benchtests of functions from math (only from string)
before you sent this patch (so I'm spending some time learning about its
outputs). I would like to comment on it in the following days.