hg: build-infra/jdk9: Fixes for RC compilation.

[magnus.ihse.bursie at oracle.com]

Changeset: b98acb91ad1c
Author:    ihse
Date:      2016-01-30 16:06 -0700
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/b98acb91ad1c

Fixes for RC compilation.

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