FreeBSD: tidy up

- mismatched comments and code,
- remove superfluous log of the "Real package" (which can
  still change! log the changed filename if it does),
- the "fix up the package name" code was replacing the
  pkg 1.17 suffix by the pkg 1.17 suffix, so it wasn't
  really being useful. Whether **any** of the backwards-
  compatibility packaging code is useful is another thing.