RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ d7595d51fe9270334dd67facb3ba1aa0fcbce116

Bernard Xiong 2bf53d315d Merge pull request #4369 from mysterywolf/removeminilibc		4 lat temu
..
README.md	db88c0b6a2 [libc] Change libc stubs to compiler folder.	8 lat temu
errno.h	9064b28c2a [license] Change license to Apache.	7 lat temu
ioctl.h	a162640f89 Signed-off-by: mysterywolf	5 lat temu
mman.h	9064b28c2a [license] Change license to Apache.	7 lat temu
stat.h	9064b28c2a [license] Change license to Apache.	7 lat temu
types.h	2bf53d315d Merge pull request #4369 from mysterywolf/removeminilibc	4 lat temu
unistd.h	c13c00e45c update	4 lat temu

Because Keil MDK leaks some system header file, we put them in here.