Commit Briefs
add flags to listener; warn if missing auth_table
in the future we'll have also plain 9p, so mark the tls listeners with L_TLS and add the libtls machinery only in that case.
don't bundle arc4random, if not available use incremented counter
it doesn't seem to work on guix, I don't feel fine editing crypto-related code and it was only used to generate a random id for clients connection. I'd love if someone will solve this thought :)