hg: build-infra/jdk9/hotspot: Reintroduce some warning flags to GensrcAdlc.gmk that were lost

[ingemar.aberg at oracle.com]

Changeset: c516eeaede19
Author:    iaberg
Date:      2016-02-18 08:10 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/c516eeaede19

Reintroduce some warning flags to GensrcAdlc.gmk that were lost

! makefiles/gensrc/GensrcAdlc.gmk