allow async connect on Win32 return WSAECONNABORTED

src/tcp_connecter.cpp

@@ -117,7 +117,8 @@ zmq::fd_t zmq::tcp_connecter_t::connect ()
 
         //  Assert that the error was caused by the networking problems
         //  rather than 0MQ bug.
-        zmq_assert (err == WSAECONNREFUSED || err == WSAETIMEDOUT);
+        zmq_assert (err == WSAECONNREFUSED || err == WSAETIMEDOUT ||
+            err == WSAECONNABORTED);
 
         errno = err;
         return retired_fd;