[PATCH] Bug 20662: checking whether x86_64-pc-linux-gnu-gcc implicitly enables -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)

[Magnus Granberg]

When glibc get compile with gcc 6.2 that have been configured with
 --enable-default-pie and --enable-default-ssp. The check that check if the 
compiler use -fstack-protector as default fail on the 32bit part.

checking for libgd... no
checking for _FORTIFY_SOURCE predefine... yes
checking whether x86_64-pc-linux-gnu-gcc -m32 -Wl,-O1 -Wl,--as-needed 
implicitly enables -fstack-protector... no
checking whether the linker provides working __ehdr_start... yes

This patch make so we look for __stack_chk_fail_local in the check.
Tested on x86_64 multilib Gentoo

Changelog:

2016-10-20  Magnus Granberg  <zorry@gentoo.org>
		Denis Kaganovich  <mahatma@eu.by>

		* configure.ac:
		Add check for __stack_chk_fail_local in libc_cv_predef_stack_protector 	
		check.
		* configure: Regenerated.

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