RT-Thread/rt-thread: KM https://github.com/RT-Thread/rt-thread.git @ 3e9c77efd5aac880e2f5d5db895d50c227dda663

Meco Man 3e9c77efd5 优化IAR		5 éve
..
sys	6c7dd30532 add function settimeofday & stime	5 éve
SConscript	b3ab8a99e1 Signed-off-by: mysterywolf	5 éve
readme.md	d5f8830177 add newlib/dlib readme	5 éve
termios.h	54143409ca 增加#include <rtconfig.h> 防止开启termios功能后报错	5 éve
time.c	3e9c77efd5 优化IAR	5 éve
unistd.c	96acad78ba 将posix_getline.h termios.h 头文件包含从<>改为""以防止路径出现分歧	5 éve

Attentions

This folder is "common" for armlibc newlibc and dlib. It's not "common" for minilibc.
If you want to add new .c files, please do not forget to fix SConscript file too. eg:
```
if GetDepend('RT_USING_POSIX') == False:
    SrcRemove(src, ['unistd.c'])
```