add apr stub to get the real OS socket

src/switch_apr.c

@@ -665,6 +665,11 @@ SWITCH_DECLARE(switch_status_t) switch_thread_create(switch_thread_t ** new_thre
 
 /* socket stubs */
 
+SWITCH_DECLARE(switch_status_t) switch_os_sock_get(switch_os_socket_t *thesock, switch_socket_t *sock)
+{
+	return apr_os_sock_get(thesock, sock);
+}
+
 SWITCH_DECLARE(switch_status_t) switch_socket_addr_get(switch_sockaddr_t ** sa, switch_bool_t remote, switch_socket_t *sock)
 {
 	return apr_socket_addr_get(sa, (apr_interface_e) remote, sock);