fix sam7x compile error

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1529 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/sam7x/startup.c

@@ -74,8 +74,6 @@ void led_flash()
  */
 void rtthread_startup(void)
 {
-	RT_DEBUG_REENT_IN
-
 	/* init hardware interrupt */
 	rt_hw_interrupt_init();
 
@@ -135,8 +133,6 @@ void rtthread_startup(void)
 	/* init idle thread */
 	rt_thread_idle_init();
 
-	RT_DEBUG_REENT_OUT
-
 	/* start scheduler */
 	rt_system_scheduler_start();