FreeBSD tar errors on valid empty tar.gz

[Steven Hartland]

Seems our current libarchive? That support FreeBSD's tar implementation has
a bug where it can create archives it cant read back. This can be seen
by simply creating an empty tar.gz file and then trying to expand or
list it.

In doing the above you get the following error:
tar: Unrecognized archive format: Inappropriate file type or format

N.B. gtar can list and expand the created file without issue.

    Regards
    Steve

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