[issue26826] Expose new copy_file_range() syscal in os module and use it to improve shutils.copy()

[STINNER Victor]

STINNER Victor added the comment:

If we add a new private function to the os module (ex:
os._copy_file_range), it can be used in shutil if available. But it
would be a temporary solution until we declare the API stable. Maybe
it's ok to add the API as public today.

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<http://bugs.python.org/issue26826>
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