Bug 4899 reported by David Holscher <David.Holscher@nav-international.com>
I copied the code snippet that Stefan did for JUnit. Thanks Stefan.
I added the possibility to specify a classpath and jvm args to ANTLR and fixed the code so that the working dir is not mandatory as specified in the docs.
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269952 13f79535-47bb-0310-9956-ffa450edef68