efl_net_server_udp: add empty functions

Summary:
these functions are never called from within this class, thus they are
empty here. They are not used because setting up the client does
require here more API than just a fd.

ref T5719
Depends on D7791

Reviewers: segfaultxavi, zmike

Reviewed By: segfaultxavi, zmike

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Maniphest Tasks: T5719

Differential Revision: https://phab.enlightenment.org/D7802

src/lib/ecore_con/efl_net_server_udp.eo

@@ -99,5 +99,8 @@ class Efl.Net.Server_Udp extends Efl.Net.Server_Ip {
         Efl.Net.Server.serve;
         Efl.Net.Server_Fd.process_incoming_data;
         Efl.Net.Server_Fd.socket_activate;
+        //These functions are not used, udp emits the there defined events from its internals
+        @empty Efl.Net.Server_Fd.client_add;
+        @empty Efl.Net.Server_Fd.client_reject;
     }
 }