[issue32394] socket lib beahavior change in 3.6.4

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Which libraries break? And which version of Windows are you running on?

If TCP_KEEPCNT was only added recently (perhaps in an SDK update) then it may not really be available on all versions.

(+Ned for awareness of the regression - not sure we need to respin immediately, but let's figure it out asap)

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keywords: +3.6regression
nosy: +ned.deily
priority: normal -> release blocker
stage:  -> test needed

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