[issue17914] add os.cpu_count()

[Yogesh Chaudhari]

Yogesh Chaudhari added the comment:

Minor modifications based on review comments.
1. Change mib array size to 2, 
2. return value set to 0 consistently (in C code), and 
3. removed IRIX #defines

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Added file: http://bugs.python.org/file30282/issue17914-6.patch

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<http://bugs.python.org/issue17914>
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