Fix warning about implicit declaration of int create_connection();

proxy.c

@@ -66,6 +66,7 @@ void server_loop();
 void handle_client(int client_sock, struct sockaddr_in client_addr);
 void forward_data(int source_sock, int destination_sock);
 void forward_data_ext(int source_sock, int destination_sock, char *cmd);
+int create_connection();
 int parse_options(int argc, char *argv[]);
 
 int server_sock, client_sock, remote_sock, remote_port = 0;