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1、为<rtconfig.h>增加了RT_USING_LIBC的宏开关;
2、解决一些函数在编译时,入口参数没有调用的警告;
3、<thread.c>文件中,rt_thread_control函数的RT_THREAD_CTRL_CLOSE项,在定义rt_err没有初始值,导致未启用RT_USING_HEAP宏时,存在未知返回值的情况,加上初始值即可。