hg: build-infra/jdk9: AIX: fixes and improvements for the new HS build

[magnus.ihse.bursie at oracle.com]

Changeset: 80a5fb967eb9
Author:    simonis
Date:      2016-02-09 15:50 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/80a5fb967eb9

AIX: fixes and improvements for the new HS build
Reviewed-by: ihse

! common/autoconf/flags.m4
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in
! make/common/NativeCompilation.gmk