make the classes flexible enough to deal with non US-ASCII filenames
either consistent with the command line ZIP tools (it has been since
it uses the org.apache classes instead of java.util.zip) or the jar
command (which it has been up to Ant 1.3).
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269272 13f79535-47bb-0310-9956-ffa450edef68