[issue15883] Add Py_errno to work around multiple CRT issue

[Mark Lawrence]

Mark Lawrence added the comment:

Am I imagining things or have I read that the Windows CRT is going to remain stable in the future, meaning this work would no longer be needed.

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components: +Windows
nosy: +BreamoreBoy, steve.dower, tim.golden, zach.ware
status: pending -> open

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15883>
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