Fix jdiff

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1531990 13f79535-47bb-0310-9956-ffa450edef68
Jdiff change for 0.12.0

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1532006 13f79535-47bb-0310-9956-ffa450edef68