Problem: regression introduced by 68d520e, changing behaviour of unblocking sockets

Solution: move unblock call to original location

src/tcp_connecter.cpp

@@ -182,6 +182,9 @@ int zmq::tcp_connecter_t::open ()
     }
     zmq_assert (_addr->resolved.tcp_addr != NULL);
 
+    // Set the socket to non-blocking mode so that we get async connect().
+    unblock_socket (_s);
+
     const tcp_address_t *const tcp_addr = _addr->resolved.tcp_addr;
 
     int rc;