hg: build-infra/jdk9: Expose SYSROOT in spec.gmk.

[magnus.ihse.bursie at oracle.com]

Changeset: 6aec0e7a7840
Author:    ihse
Date:      2014-12-02 14:46 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/6aec0e7a7840

Expose SYSROOT in spec.gmk.

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