Log Message:
archivers/start: Update to 1.6.1nb15

Changelog from AN-2021-07-29:
- star: A single Linux xattr entry with a zero length value did disable
  all Linux xattrs for the related file. This is now handled correctly.

  Note that setfattr(1) on some Linux versions does not support to set
  empty xattr entries, but star on the same system can extract files
  with empty xattr entries.

  Thanks to a report from Dennis Katsonis

- star: star -version now prints a new version date