Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56560
Fix NoClassDefFoundError when using Jasper Ant task.
Patch provided by M.Gemmell.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1602018 13f79535-47bb-0310-9956-ffa450edef68