math build regression

[David Miller]

From: Roland McGrath <roland@hack.frob.com>
Date: Fri,  9 Mar 2012 13:27:07 -0800 (PST)

>> My interpretation is that Richard's changes make it such that every
>> arch must now supply a math_private.h file.
>> 
>> No such requirement existed previously, and sparc has never had one.
> 
> I think that just means we need an include/math_private.h that
> #include's <math/math_private.h>.

I'll test that out after I finish testing Joseph's patch with the
troublesome math bits reverted.