[issue2890] O_ASYNC and FASYNC should be defined for *nix systems

[Ismail Donmez]

Ismail Donmez <ismail at namtrac.org> added the comment:

Python code already has GNU/Windows only exceptions. Attached patch adds
O_ASYNC and FASYNC as GNU extensions. If accepted I can send a
complimentary documentation patch.

Added file: http://bugs.python.org/file10342/async.patch

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