Tighten up the heuristic that decides whether or not we should obey or ignore the size field on a hardlink entry.  In particular, if we're reading a non-POSIX archive, we should always ignore the size field.
Tighten up the heuristic that decides whether or not we should
obey or ignore the size field on a hardlink entry.  In particular,
if we're reading a non-POSIX archive, we should always ignore
the size field.

This should fix both the audio/xmcd port and the math/unixstat port.

Thanks to: Pav Lucistnik for pointing these two ports out to me.
MFC after: 7 days

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