import RT-Thread@9217865c without bsp, libcpu and components/net

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Zihao Yu 2023-05-20 16:23:33 +08:00
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This folder provides functions that are not part of the standard C library but are part of the POSIX.1 (IEEE Standard 1003.1) standard.
## NOTE
1. For consistency of compilation results across the different of platforms(gcc, keil, iar) , use:
- `#include <sys/time.h>` to instead of `#include <time.h>`
- `#include <sys/errno.h>` to instead of `#include <errno.h>`
- `#include <sys/signal.h>` to instead of `#include <signal.h>`