hg: build-infra/jdk9: Fix check for -fstack-protector-all properly (allows aarch64 native tests to compile in slowdebug)

[magnus.ihse.bursie at oracle.com]

Changeset: 5107c68b0d19
Author:    ihse
Date:      2016-01-31 23:55 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/5107c68b0d19

Fix check for -fstack-protector-all properly (allows aarch64 native tests to compile in slowdebug)

! common/autoconf/flags.m4
! common/autoconf/generated-configure.sh