hg: build-infra/jdk9/hotspot: Let features be per variant.

[magnus.ihse.bursie at oracle.com]

Changeset: d211380aff19
Author:    ihse
Date:      2015-10-09 14:03 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/d211380aff19

Let features be per variant.

! makefiles/CompileJvm.gmk
! makefiles/GenerateSources.gmk
! makefiles/GensrcJvmti.gmk
! makefiles/JvmFeatures.gmk
! makefiles/JvmFeaturesConf.gmk
! makefiles/JvmPlatforms.gmk
! makefiles/JvmPlatformsConf.gmk