Remove mention of Java 1.3 and 1.4 since we only run on Java 5.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636647 13f79535-47bb-0310-9956-ffa450edef68
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git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1636649 13f79535-47bb-0310-9956-ffa450edef68