Add an extra tarball retry step without --verbatim-files-from

Steve McIntyrerequested to merge
93sam/pristine-tar:retry-non-verbatim into master

The fix for #851286 added that option to tar, but that causes some older stored tarballs to no longer reproduce. Try again without it, if needed. Closes: #933031

Signed-off-by: Steve McIntyre 93sam@debian.org

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