Log Message:
s6: update to 2.12.0.0. Changes:

- New option to s6-svc: -s, to specify a signal by name (or number).
- New option to s6-log: -t, to specify a timeout for partial last lines.
- s6-svscan rewrite: no more quadratic reaps, no more forced 1s wait on shutdown
- Eliminated fork() wherever possible on systems supporting posix_spawn()
- Obsolete s6lockd subsystem removed.