hg: jdk/submit: 8130017: use _FORTIFY_SOURCE in gcc fastdebug builds

[matthias.baesken at sap.com]

Changeset: b8a3e3920720
Author:    mbaesken
Date:      2019-05-14 10:21 +0200
URL:       http://hg.openjdk.java.net/jdk/submit/rev/b8a3e3920720

8130017: use _FORTIFY_SOURCE in gcc fastdebug builds

! make/autoconf/flags-cflags.m4
! test/fmw/gtest/src/gtest.cc