Since the tar bidder can never get called more than once, it

doesn't need to compensate for this situation.

While here, fix a minor longstanding bug that empty tar archives
(which begin with at least 512 zero bytes) never properly reported
their format.  In particular, this fixes the output of:
   bsdtar tvvf /dev/zero

And, of course, a new test to verify that libarchive correctly
recognizes the format of such files.

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