[WHISKER-13] Remove the work-around for Javadoc that made the site build work on Java 8, because it makes the site build fail on Java 6 and 7.

git-svn-id: https://svn.apache.org/repos/asf/creadur/whisker/trunk@1622964 13f79535-47bb-0310-9956-ffa450edef68