don't duplicate the 'do I need zip64' check when creating central directory headers

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1648164 13f79535-47bb-0310-9956-ffa450edef68
Removed duplication between ZipArchiveOutputStream and StreamCompressor

All tests pass, but this commit needs a long hard look before pushing to
ASF