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

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Zihao Yu 2023-05-20 16:23:33 +08:00
commit e2376a3709
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Because of the history issue, flags in fcntl.h, such as O_CREAT, have difference types of value. Some OS use hex flags and others use octal flags.
In terms of RT-Thread, Keil, IAR and MSVC use octal flags, which is located in the `tcntl/octal` folder; newlib uses hex flags; musl uses octal flags.