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

[Jonathan Gibbons]

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/
-- Jon