hg: jdk9/sandbox/jdk: Add LEGACYVER_ prefix to old make variables

[magnus.ihse.bursie at oracle.com]

Changeset: d788e948b980
Author:    ihse
Date:      2015-02-23 14:35 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/d788e948b980

Add LEGACYVER_ prefix to old make variables

! make/launcher/LauncherCommon.gmk
! make/lib/CoreLibraries.gmk