bump(app-arch/lbzip2): sync with upstream

Hopefully fixes intermittant segfaults during builds which I think are
the fault of lbzip2, but for good measure update the whole lot.

Packages updated:
  app-arch/bzip2
  app-arch/lbzip2
  app-arch/tar
Merge pull request #137 from marineam/tar

bump(app-arch/lbzip2): sync with upstream