Handle Zip archives that are "multi-part archives with only

one part" by simply ignoring the marker at the beginning
of the file.  (Zip archivers reserve four bytes at the beginning
of each part of a multi-part archive, if it happens to only
require one part, those four bytes get filled with a placeholder
that can be ignored.)

Thanks to: Marius Nuennerich,
	 for pointing me to a Zip archive that libarchive couldn't handle
MFC after: 7 days

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