Add helper lib 'zmq_x', to workaround the annoying problem of 'ipc' and 'inproc' with Windows.
@note 'zmq_x.h' must be included AFTER 'zmq.h'
@todo 'zmq_socket_monitor' to be implemented properly
@todo dummy hack for the moment, just make it possible to use 'ipc' and 'inproc' within one process. though, it seems that Windows named pipe could be the final solution