DERBY-5949: Revert the hack around the Open JDK 8 bug which choked the generation of toursdb; the Open JDK bug has been fixed and the fix has propagated to the Open JDK repository which contains JDBC 4.2.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1446255 13f79535-47bb-0310-9956-ffa450edef68