Make it fly with 1.1

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@267946 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Javadoc.java

@@ -906,7 +906,7 @@ public class Javadoc extends Task {
     	if (foundJavaFile) {
     		String newPkg = vpath.substring(1).replace(File.separatorChar, '.');
     		if (!pkgs.contains(newPkg)) {
-    			pkgs.add(newPkg);
+    			pkgs.addElement(newPkg);
     		}
     	}