[issue32394] socket lib beahavior change in 3.6.4

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

It seems Linux has TCP_KEEPCNT from very old ages and
just checking it's existence was OK for many years.
So I'm +0.5 on this Python-side fix.

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<https://bugs.python.org/issue32394>
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