hg: build-infra/jdk9: Clean up custom variant wrt features.

[magnus.ihse.bursie at oracle.com]

Changeset: 675f80557506
Author:    ihse
Date:      2016-02-09 15:47 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/675f80557506

Clean up custom variant wrt features.

! common/autoconf/generated-configure.sh
! common/autoconf/hotspot.m4
! common/autoconf/spec.gmk.in