Added missing license information

git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/trunk@1577754 13f79535-47bb-0310-9956-ffa450edef68
Generate ivy.xml files containing the ASL license.

git-svn-id: https://svn.apache.org/repos/asf/ant/ivy/core/trunk@1577758 13f79535-47bb-0310-9956-ffa450edef68