New Issue: SysBasic module: Should we keep the four remaining error codes labeled POSIX?

20132, "lydia-duncan", "SysBasic module: Should we keep the four remaining error codes labeled POSIX?", "2022-06-30T21:54:05Z"

We believe these are POSIX extensions or optional error codes, rather than error codes that must be provided. We think these are unlikely to be used and so don't merit getting moved to the OS.POSIX module, but can add them if someone requests them.