Avoid a divide by zero error on non-Core i cpus.

Also support Linux and, why not, Android too.  Sorry @thedax, a string compare on the brand name just seems weird...

http://software.intel.com/sites/default/files/m/d/4/1/d/8/Kuo_CpuTopology_rc1.rh1.final.pdf

I'm not sure about ignoring ECX and EAX but, this will at least check that `logical_cpu_count` ain't gonna be 0, which it will be if not supported.

-[Unknown]