Write queue after connect windows

Hum. Not having a handle is basically like not having a fd, that returns EBADF on Unix. Now, weren't we supposed to check if connect_req is not NULL and queue in that case?

Also, this needs to check if there were previously queued writes, because in that case we need to append to the queue:  create the pipe, write some reqs (queued), uv_pipe_connect, write some more reqs (need to be queued, not immediately written or queue order is fucked up)