[issue32394] socket lib beahavior change in 3.6.4

[TJG]

TJG <mail at timgolden.me.uk> added the comment:

It's a compile-time option in socketmodule.c.

https://github.com/python/cpython/blob/3.6/Modules/socketmodule.c#L7466

The MSDN page suggests that it was added for Win10:

https://msdn.microsoft.com/en-us/library/windows/desktop/ms738596(v=vs.85).aspx

Is it possible that the build machine has changed its OS/SDK between 
building 3.6.3 and 3.6.4?

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nosy: +tjguk

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