Use math_narrow_eval more consistently [committed]

[Joseph Myers]

On Thu, 24 Sep 2015, Steve Ellcey wrote:

> It looks like math_private.h was never included in a file that got built
> for mips16 before.  If I build an earlier version of glibc and put a
> deliberate syntax error in libc_fesetenv_mips that will only trigger
> when building for mips16, it never triggers.

Thanks for the explanation.  Your patch is OK.

-- 
Joseph S. Myers
joseph@codesourcery.com