Implemented NtSignalAndWaitForSingleObject.

diff --git a/server/serial.c b/server/serial.c
index 6f90f5f..014142e 100644
--- a/server/serial.c
+++ b/server/serial.c
@@ -101,6 +101,7 @@
     default_fd_remove_queue,      /* remove_queue */
     default_fd_signaled,          /* signaled */
     no_satisfied,                 /* satisfied */
+    no_signal,                    /* signal */
     serial_get_fd,                /* get_fd */
     serial_destroy                /* destroy */
 };