add libc_stdio.h

include/libc/libc_stdio.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * File      : libc_stdio.h
+ *
+ * Change Logs:
+ * Date                 Author             Notes
+ * 2020-09-05     Meco Manthe  first version
+ */
+
+#ifndef LIBC_STDIO_H__
+#define LIBC_STDIO_H__
+
+#include <posix_getline.h>
+
+#endif