- At least on NetBSD every files on /var/run are removed at every
boot by mountcritlocal rc.d script. Add a bitlbee_precmd() function
to always check that a directory for the ${pidfile} exists and
create it if needed.
- Check if /etc/rc.subr exists before source-ing it.
- Introduce BITLBEE_USER and BITLBEE_GROUP variables and reuse them to avoid
hardcoding `bitlbee' and `nobody' (NFCI)
Discussed with and suggestions from <tonio>, thanks!
c87a3b213d