You didn’t send changes for these functions to ucrtbase spec file. Forwards to stubs are removed by make_specfiles script, I guess this is why it was removed from the api-ms-win-crt-private-l1-1-0 spec file.
Ah, indeed looking at my git checkout, I forgot to stage the last changes before committing. Makes sense that forwards to stubs would be removed by the script, thanks for clarifying.
Will send a patch for the missing functions shortly.
Cheers, Benedikt