Remove init_array / fini_array configure test

[Carlos O'Donell]

On 11/02/2015 09:32 AM, Joseph Myers wrote:
> There is a configure test "for .preinit_array/.init_array/.fini_array
> support".  Support for this feature was added in binutils 2.13, so the
> configure test is obsolete; this patch removes it.
> 
> Tested for x86_64 and x86 (testsuite, and that installed shared
> libraries are unchanged by the patch).
> 
> 2015-11-02  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* configure.ac (libc_cv_initfini_array): Remove configure test.
> 	* configure: Regenerated.

LGTM given that 2.13 < 2.22 (required).

c.