update build.xml for new clover version
update build.xml for new clover version

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@926629 13f79535-47bb-0310-9956-ffa450edef68

apache/solr,apache/solr,apache/solr,apache/solr,apache/solr