Recognize hardlinks when reading cpio files.

This doesn't yet address the issue of selective restore
of hardlinked files.  With cpio format, it's possible to correctly
restore any linked file; the API doesn't yet fully support this.
(There's no way for the library to inform a client whether or not
there's a file body associated with this entry.  The assumption
right now is that "hardlink" entries have no file body.)

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