bsdtar can't handle files >8GB

[Josh Carroll]

> tar: Unrecognized archive format: Inappropriate file type or format
> tar: Error exit delayed from previous errors.

Confirmed in RELENG_7 as well. Interestingly enough, if the file
inside the tarball is nothing but zeros (dd if=/dev/zero ...), I don't
get this error.  However, it doesn't work either. The resulting file
is 0 bytes, rather than 10 GB of \0.

Note that 10 1GB files worked just fine.

Josh