This change supports building with `-DWAMR_BUILD_LIBC_WASI=0` and `-DWAMR_BUILD_DEBUG_INTERP=1`, otherwise the os_socket_* functions will be undefined.
This folder contains the platform abstract layer for multiple platforms. To support a new platform, you can simply create a new folder here and implement all the APIs defined in include folder.
Refer to port_wamr.md for how to port WAMR to a target platform.