[issue18923] Use the new selectors module in the subprocess module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 71b618f0c8e9 by Charles-François Natali in branch 'default':
Issue #18923: Update subprocess to use the new selectors module.
http://hg.python.org/cpython/rev/71b618f0c8e9

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nosy: +python-dev

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