Review request for JDK-8160953: Update build-nagen-eclipse task to work with JDK 9

[Attila Szegedi]

So, now that we finally seem to have an Eclipse Neon build that works reasonably well with JDK 9:

Please review JDK-8160953 "Update build-nagen-eclipse task to work with JDK 9" at <http://cr.openjdk.java.net/~attila/8160953/webrev.jdk9> for <https://bugs.openjdk.java.net/browse/JDK-8160953>

Thanks,
  Attila.