handle WSAEADDRINUSE in tcp_connecter_t::connect

As mentioned on the mailing list, Windows may return WSAEADDRINUSE when binding
(reconnecting) to a port. Added this to the handled error codes as Pieter
suggested.

src/tcp_connecter.cpp

@@ -318,7 +318,8 @@ zmq::fd_t zmq::tcp_connecter_t::connect ()
             err == WSAENETUNREACH ||
             err == WSAENETDOWN ||
             err == WSAEACCES ||
-            err == WSAEINVAL)
+            err == WSAEINVAL ||
+            err == WSAEADDRINUSE )
             return retired_fd;
         wsa_assert_no (err);
     }