hg: build-infra/jdk8: Remove unused variables from spec.gmk. Start trying to separate proper

[magnus.ihse.bursie at oracle.com]

Changeset: ba1603d10aba
Author:    ihse
Date:      2012-06-12 16:26 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/ba1603d10aba

Remove unused variables from spec.gmk. Start trying to separate proper
variables from legacy variables.

! common/autoconf/generated-configure.sh
! common/autoconf/jdk-options.m4
! common/autoconf/source-tree.m4
! common/autoconf/spec.gmk.in
! common/makefiles/Makefile