JDiff output for release 0.21.0

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.21@988653 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -961,7 +961,6 @@
          <param name="-apidir" value="${jdiff.xml.dir}"/>
          <param name="-apiname" value="hadoop-core ${version}"/>
          <param name="${jdiff.stability}"/>
-         <param name="${jdiff.compatibility}"/>
        </doclet>
        <packageset dir="src/java"/>
        <classpath >