[issue19624] Switch constants in the errno module to IntEnum

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

I'm not sure whether changing the errno module to use enums would be conceptually correct:

enums declare a fixed set of permitted values, but errno values can be any integer, are platform dependent and are sometimes not unique (e.g. EWOULDBLOCK = EAGAIN, or the various Windows WSA errno values which map to similar integers as the Unix ones).

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nosy: +lemburg

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<http://bugs.python.org/issue19624>
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