hg: build-infra/jdk9/hotspot: Clean up gensrc.

[magnus.ihse.bursie at oracle.com]

Changeset: 0022be853887
Author:    ihse
Date:      2015-12-15 19:49 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/0022be853887

Clean up gensrc.

! makefiles/GenerateSources.gmk
! makefiles/GensrcAdlc.gmk
! makefiles/GensrcDtrace.gmk
! makefiles/GensrcJvmti.gmk