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Implement os.getnumcpus() with FreeBSD compatibility

Implement os.getnumcpus() with FreeBSD compatibility: a task in LegoFlow-SWE (Harbor dataset). An attempt to provide a cross‑platform os.getnumcpus() function fails to build on FreeBSD 14.1 with the following compiler error:

The task

An attempt to provide a cross‑platform `os.getnumcpus()` function fails to build on FreeBSD 14.1 with the following compiler error:

Part of Lego-X/LegoFlow-SWE.