Implemented NtSignalAndWaitForSingleObject.

diff --git a/server/trace.c b/server/trace.c
index d12c962..2de4ddf 100644
--- a/server/trace.c
+++ b/server/trace.c
@@ -760,6 +760,7 @@
 {
     fprintf( stderr, " flags=%d,", req->flags );
     fprintf( stderr, " cookie=%p,", req->cookie );
+    fprintf( stderr, " signal=%p,", req->signal );
     fprintf( stderr, " timeout=" );
     dump_abs_time( &req->timeout );
     fprintf( stderr, "," );