Fix BSD cpu count #4466
@wmoxam from CI there are two files where the formatter is not happy.
Error: formatting 'src/lib_c/amd64-unknown-openbsd/c/sysctl.cr' produced changes
To clarify @bew comment, #4450 is the first PR trying to move all the platform specifics in it's own namespace and offer a better abstraction. If you want to can take the stab here in this same PR. But if not a refactor will follow probably.