HADOOP-1726. Remove ant.jar from lib/jetty-ext.

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@567773 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -611,6 +611,7 @@
           <fileset dir="src/contrib/">
             <include name="*/lib/*.jar" />
           </fileset>
+          <pathelement path="${java.class.path}"/>
         </classpath>
 
     	<group title="Core" packages="org.apache.*"/>