add license and copyright info

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@226 bbd45198-f89e-11dd-88c7-29a3b14d5316

src/clock.c

@@ -1,11 +1,11 @@
 /*
  * File      : clock.c
  * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006, RT-Thread Development Team
+ * COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
  *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
- * http://openlab.rt-thread.com/license/LICENSE
+ * http://www.rt-thread.org/license/LICENSE
  *
  * Change Logs:
  * Date           Author       Notes
@@ -50,7 +50,7 @@ rt_tick_t rt_tick_get()
 }
 
 /**
- * This function will notify kernel there is one tick passed. Normally, 
+ * This function will notify kernel there is one tick passed. Normally,
  * this function is invoked by clock ISR.
  */
 void rt_tick_increase()