Remove configure tests for needing -P for .S files

[Florian Weimer]

On 10/26/2015 05:52 PM, Joseph Myers wrote:
> 2015-10-26  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* configure.ac (libc_cv_need_minus_P): Remove configure test.
> 	* configure: Regenerated.
> 	* Makeconfig (asm-CPPFLAGS): Remove reference to -P in comment.

Okay.

Thanks,
Florian