RFR: JDK-8193512: remove remnants of javah from jdk/jdk10 repo

[Tim Bell]

Jon:

> Please review these changes to remove the remnants of javah (and in a
> couple of tests, some remnants of apt and an earlier version of javap)
> from the repo, now that the tool itself has been removed.
>
> JBS: https://bugs.openjdk.java.net/browse/JDK-8193512
> Webrev: http://cr.openjdk.java.net/~jjg/8193512/webrev.00/

Looks good.

Tim