添加rtthread相关代码

riscv/rtthread/components/libc/compilers/newlib/machine/time.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-02-16     Meco Man     The first version
+ */
+
+#ifndef _MACHTIME_H_
+#define _MACHTIME_H_
+
+#include <rtconfig.h>
+#define _CLOCKS_PER_SEC_   RT_TICK_PER_SECOND
+
+#endif  /* _MACHTIME_H_ */