Several files already had standard license header (namely 2-clause BSD files), yet due to the 80 char line length limit, they were not treated as such by source-check.sh (which fate-source uses). Therefore relax the BSD check. Reviewed-by: Rémi Denis-Courmont <remi@remlab.net> Reviewed-by: Pierre-Anthony Lemieux <pal@sandflow.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>