Implemented NtSignalAndWaitForSingleObject.

diff --git a/server/request.c b/server/request.c
index 4f943d0..8d33660 100644
--- a/server/request.c
+++ b/server/request.c
@@ -93,6 +93,7 @@
     NULL,                          /* remove_queue */
     NULL,                          /* signaled */
     NULL,                          /* satisfied */
+    no_signal,                     /* signal */
     no_get_fd,                     /* get_fd */
     master_socket_destroy          /* destroy */
 };