Revert "Merge branch 'master' of github.com:ianbarber/libzmq"

This reverts commit 3345902979, reversing
changes made to 889b0e6f29.

src/session_base.hpp

@@ -104,8 +104,8 @@ namespace zmq
         //  Pipe connecting the session to its socket.
         zmq::pipe_t *pipe;
         
-        //  This flag is set if we are disconnecting, but haven't yet completed
-        int incomplete_detach;
+        //  Socket end of the pipe, for delay attach scenario
+        zmq::pipe_t *outpipe;
 
         //  This flag is true if the remainder of the message being processed
         //  is still in the in pipe.