[PATCH] support for accessing CPU/core count (processor-count)

[Campbell Barton]

Hi, this patch adds support for accessing the number of CPU's / cores on 
a system, matching CPython's multiprocessing.cpu_count() [0].

I've only tested this for Linux, this includes code that should work on 
other platforms, although that would need to be double-checked of course.
For reference I checked CPython / Blender & Stack-overflow [1]

Accessing this information can be useful to automatically detect the 
number of jobs to run.


[0]: 
https://docs.python.org/3/library/multiprocessing.html#multiprocessing.cpu_count
[1]: https://stackoverflow.com/a/3006416/432509

0001-processor-count.patch
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