hg: build-infra/jdk9/hotspot: Introduce JVM_VARIANT_OUTPUTDIR.

[magnus.ihse.bursie at oracle.com]

Changeset: 87b0d6061aa2
Author:    ihse
Date:      2016-01-22 23:10 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/87b0d6061aa2

Introduce JVM_VARIANT_OUTPUTDIR.

! makefiles/Dist.gmk
! makefiles/gensrc/GenerateSources.gmk
! makefiles/gensrc/GensrcAdlc.gmk
! makefiles/gensrc/GensrcJvmti.gmk
! makefiles/lib/CompileDtrace.gmk
! makefiles/lib/CompileJvm.gmk
! makefiles/lib/CompileLibjsig.gmk
! makefiles/lib/CompileLibraries.gmk
! makefiles/lib/JvmFeatures.gmk