zmq: narrow condition to include TIPC in build/test

As TIPC transport for 0MQ will only work on post 3.8
Linux kernels where nonblocking connect was added,
we add AC_RUN test to check for this functionality.
Should the test fail, tipc is excluded from build/test.

Signed-off-by: Erik Hugne <erik.hugne@ericsson.com>

src/session_base.cpp

@@ -501,7 +501,7 @@ void zmq::session_base_t::start_connecting (bool wait_)
         return;
     }
 #endif
-#if defined ZMQ_HAVE_LINUX
+#if defined ZMQ_HAVE_TIPC
     if (addr->protocol == "tipc") {
         tipc_connecter_t *connecter = new (std::nothrow) tipc_connecter_t (
             io_thread, this, options, addr, wait_);