tar: Error opening archive: Unrecognized archive format

[Matthew Seaman]

There seem to be a lot of pkg fallout mails all with the same error:

   tar: Error opening archive: Unrecognized archive format

This is affecting package building on head -- mostly perl modules from
what I'm seeing, but that may just be sampling bias.

I suspect that something has broken with the latest MFV of libarchive
code in r309299

	Cheers,

	Matthew

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