Fixed some of the issues reported by Solaris Lint.

diff --git a/scheduler/debugger.c b/scheduler/debugger.c
index c777c59..c5b4c54 100644
--- a/scheduler/debugger.c
+++ b/scheduler/debugger.c
@@ -4,6 +4,8 @@
  * Copyright (C) 1999 Alexandre Julliard
  */
 
+#include <string.h>
+
 #include "process.h"
 #include "thread.h"
 #include "server.h"