hg: build-infra/jdk9/jdk: Replace legacy JVM_VARIANT_* variables with new style checks.

[magnus.ihse.bursie at oracle.com]

Changeset: d88ab1ab8cdc
Author:    ihse
Date:      2016-02-09 22:23 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/jdk/rev/d88ab1ab8cdc

Replace legacy JVM_VARIANT_* variables with new style checks.

! make/Import.gmk
! make/copy/Copy-java.base.gmk
! make/lib/CoreLibraries.gmk