unix: turn off POLLOUT after stream connect
unix: turn off POLLOUT after stream connect

Clear the POLLOUT flag after we're done connecting. Not doing so isn't
really harmful but it may cause the event loop to wake up more often
than it has to.

urbit/archaeology2,unknownbrackets/maxcso,urbit/archaeology2,urbit/archaeology2,urbit/archaeology2,urbit/archaeology2,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,urbit/archaeology2,unknownbrackets/maxcso,urbit/archaeology2,unknownbrackets/maxcso,urbit/archaeology2,unknownbrackets/maxcso,urbit/archaeology2