zmqeventconsumer/zmqeventsupplier: Make it compatible with all stock cppzmq versions

Depending on the cppzmq version from https://github.com/zeromq/cppzmq the
operator void* is either implicit or explicit.

We could now add a feature check in cmake to check for that and use code
paths for each variant.

But we could also be really pragmatic and just use a unconditional
static_cast<void*>.

Idea and initial patch by Michal Liszcz.

Author: t-b

cppapi/client/zmqeventconsumer.cpp

@@ -181,9 +181,9 @@ void *ZmqEventConsumer::run_undetached(TANGO_UNUSED(void *arg))
 	zmq::pollitem_t *items = new zmq::pollitem_t [MAX_SOCKET_SUB];
 	int nb_poll_item = 3;
 
-	items[0].socket = *control_sock;
-	items[1].socket = *heartbeat_sub_sock;
-	items[2].socket = *event_sub_sock;
+	items[0].socket = static_cast<void*>(*control_sock);
+	items[1].socket = static_cast<void*>(*heartbeat_sub_sock);
+	items[2].socket = static_cast<void*>(*event_sub_sock);
 
 	for (int loop = 0;loop < nb_poll_item;loop++)
 	{
@@ -1063,7 +1063,7 @@ bool ZmqEventConsumer::process_ctrl(zmq::message_t &received_ctrl,zmq::pollitem_
 // Update poll item list
 //
 
-                poll_list[old_poll_nb].socket = *tmp_sock;
+                poll_list[old_poll_nb].socket = static_cast<void*>(*tmp_sock);
                 poll_list[old_poll_nb].fd = 0;
                 poll_list[old_poll_nb].events = ZMQ_POLLIN;
                 poll_list[old_poll_nb].revents = 0;

cppapi/server/zmqeventsupplier.cpp

@@ -686,7 +686,7 @@ void ZmqEventSupplier::create_mcast_socket(string &mcast_data,int rate,McastSock
 // Bind the publisher socket to the specified port
 //
 
-    if (zmq_bind(*(ms.pub_socket),ms.endpoint.c_str()) != 0)
+    if (zmq_bind(static_cast<void*>(*ms.pub_socket),ms.endpoint.c_str()) != 0)
     {
         TangoSys_OMemStream o;
         o << "Can't bind ZMQ socket with endpoint ";