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Currently `cpuinfo.countProcessor` uses hard-coded `HW_AVAILCPU=25` for both MacOS and BSD; However, [There is no HW_AVAILCPU on FreeBSD, NetBSD, and OpenBSD]( https://bugs.webkit.org/show_bug.cgi?id=132542) Also, `HW_AVAILCPU` is undocmented in MacOS, while `sysctlbyname("hw.logicalcpu",...)` is documented and used by many other languages' implementations, like [Haskell](https://gitlab.haskell.org/ghc/ghc/-/blob/master/rts/posix/OSThreads.c?ref_type=heads#L376) --- This PR: - use `importc` value instead of hard-coded values for `HW_*` macros. - use "hw.logicialcpu" over undocumented HW_AVAILCPU. - reduce 2 elements of `mib` array when calling `sysctl` as they're no use.