additions for win32
introduce AF_NN_NAMEDPIPE to track named pipes vs sockets
use the right field
WIP. Semantics were wrong for the client side. It needs to be a CreateFile call. Unfortunately there is no async CreateFile, which means connecting the client before binding the server fails. So for now, work towards the more simple test case of server first, then client.
WIP - Named pipes don't have the concept of a listening socket and a client socket. Leaving nn_bipc_start_listening empty and moving to do everything where the client socket normally is.