8024501: sun.security.mscapi.Key has no definition of serialVersionUID

Reviewed-by: weijun

src/windows/classes/sun/security/mscapi/Key.java

 /*
- * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -39,6 +39,7 @@ import sun.security.util.Length;
  */
 abstract class Key implements java.security.Key, Length
 {
+    private static final long serialVersionUID = -1088859394025049194L;
 
     // Native handle
     protected long hCryptProv = 0;