update stm32 porting.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1507 bbd45198-f89e-11dd-88c7-29a3b14d5316

libcpu/arm/stm32/interrupt.c

-/*
- * File      : interrupt.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 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://www.rt-thread.org/license/LICENSE
- *
- * Change Logs:
- * Date           Author       Notes
- * 2009-01-05     Bernard      first version
- */
-
-#include <rtthread.h>
-
-/* exception and interrupt handler table */
-rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrput_flag;
-
-/*@}*/