hg: build-infra/jdk9: Enabled cross compiling (arm)

[ingemar.aberg at oracle.com]

Changeset: 024ac71466c0
Author:    iaberg
Date:      2015-06-02 14:12 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/024ac71466c0

Enabled cross compiling (arm)

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