removing mention of a first build step under JDK 1.4

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1452171 13f79535-47bb-0310-9956-ffa450edef68
preparing a 1.9.0 version

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1452175 13f79535-47bb-0310-9956-ffa450edef68