[issue18720] Switch suitable constants in the socket module to IntEnum

[Charles-François Natali]

Charles-François Natali added the comment:

> The attached patch fixes it in a similar vein to what was done for the
> family accessor: getaddrinfo is overridden in Python and does the necessary
> conversion.

Am I the only one thinking that wrapping every C function with a
Python counterpart to perform enum conversions is tedious, ugly and
error-prone :-\

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18720>
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