Fix CPU count determination on some UNIX systems
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#468 Fix CPU count determination on some UNIX systems
Use sysctl _SC_NPROCESSORS_ONLN instead of _SC_NPROCESSORS_CONF to determine the number of online and available CPUs.
On OpenBSD / amd64 for example SMT is disabled by default so the code currently falsely determines 8 CPUs are online when it should be 4.
