If the CPU reaches the failing temps during Prime95 then sysbench will be
run to emulate a less artificial workload. The both the overall and sysbench
max temps are recorded and shown in the results.
Added new option to track an alternate max temp value in wk.hw.sensors.
This was needed so show two different max temps recorded during CPU testing.
Sysbench was added to the Linux package list and is compiled for macOS.
Without manually compiling the package it brings in way too many dependencies
to support SQL DB testing (which we don't need).
