[issue14437] _io build fails on cygwin

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The proposed patch is correct; no extension module should use PyAPI_ for its own symbols.

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue14437>
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