fixed errno issue when using newlib.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1729 bbd45198-f89e-11dd-88c7-29a3b14d5316

src/kservice.c

@@ -25,12 +25,9 @@
  */
 /*@{*/
 
-#ifndef RT_USING_NEWLIB
 /* global errno in RT-Thread */
 static volatile int _errno;
-#else
-#include <errno.h>
-#endif
+
 #if defined(RT_USING_DEVICE) && defined(RT_USING_CONSOLE)
 static rt_device_t _console_device = RT_NULL;
 #endif