Problem: ZMQ_CONNECT_ROUTING_ID can be assigned to incoming socket connection (Issue #3191)

Solution: Add an identifier parameter for local attach to zmq::socket_base_t::attach_pipe

src/dgram.cpp

@@ -51,9 +51,12 @@ zmq::dgram_t::~dgram_t ()
     zmq_assert (!_pipe);
 }
 
-void zmq::dgram_t::xattach_pipe (pipe_t *pipe_, bool subscribe_to_all_)
+void zmq::dgram_t::xattach_pipe (pipe_t *pipe_,
+                                 bool subscribe_to_all_,
+                                 bool locally_initiated_)
 {
     LIBZMQ_UNUSED (subscribe_to_all_);
+    LIBZMQ_UNUSED (locally_initiated_);
 
     zmq_assert (pipe_);