[issue16104] Use multiprocessing in compileall script

[Claudiu.Popa]

Claudiu.Popa added the comment:

Here's a new version which catches ImportError for concurrent.futures and raises ValueError in `compile_dir` if `processes` was specified and concurrent.futures is unavailable. The only issue is that I don't know if this should be a ValueError or not. For instance, zipfile uses RuntimeError if `lzma` is unavailable.

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Added file: http://bugs.python.org/file34401/issue16104_6.patch

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