RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 9d401ea8b06518a49b59b6d246325afa5902e3f4

réplica de https://github-proxy.rt-thread.io/RT-Thread/rt-thread.git

Meco Man 9d401ea8b0 重新整理libc重复共用文件，创建common_for_all 和 common_for_keiliar		%!s(int64=4) %!d(string=hai) anos
..
README.md	db88c0b6a2 [libc] Change libc stubs to compiler folder.	%!s(int64=8) %!d(string=hai) anos
errno.h	3c05a4e719 [compoenets] auto & manual formatted	%!s(int64=5) %!d(string=hai) anos
signal.h	3c05a4e719 [compoenets] auto & manual formatted	%!s(int64=5) %!d(string=hai) anos

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