If single files larger than 4GB where added the recorded file sizes
in the local file header where not updated correctly. Additionally
recorded file sizes in the central directory where in the wrong order
making it impossible to extract.
To enable adding files with unknown size which might be larger than 4GB
the new method wxZipOutputStream::SetFormat() is added.
Additionally a check has been added in case a file larger 4GB has been
written without ZIP64 info.
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