Accepts a new client, should emit "client,add".
Remember to create the client object with a callback to EFL_IO_CLOSER_EVENT_CLOSED during the construction, decrease Efl.Net.Server.clients_count as well as unref the client and remove yourself as parent.
The new clients should have the server as parent and increase the Efl.Net.Server.clients_count.
Whenever this function fails, it must close the given client file descriptor.
Overridden from Efl.Net.Server_Fd.client_add.
client_add @protected @pure_virtual { params { @in client_fd: int; } }
void efl_net_server_fd_client_add(Eo *obj, int client_fd);