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Author tjguk
Recipients ned.deily, paul.moore, skn78, steve.dower, thatiparthy, tim.golden, tjguk, zach.ware
Date 2017-12-21.17:09:09
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It's a compile-time option in socketmodule.c.

The MSDN page suggests that it was added for Win10:

Is it possible that the build machine has changed its OS/SDK between 
building 3.6.3 and 3.6.4?
Date User Action Args
2017-12-21 17:09:10tjguksetrecipients: + tjguk, paul.moore, tim.golden, ned.deily, zach.ware, steve.dower, thatiparthy, skn78
2017-12-21 17:09:10tjguklinkissue32394 messages
2017-12-21 17:09:10tjgukcreate