[issue26590] socket destructor: implement finalizer

[STINNER Victor]

STINNER Victor added the comment:

> Now that there is a safe finalizer, I wonder if it should release the GIL, as in sock_close().

Ah yes, good idea. I updated my patch.

I also changed the change to begin by setting the sock_fd attribute to -1, before closing the socket (since the GIL is now released, the order matters).

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Added file: http://bugs.python.org/file42230/sock_finalize-2.patch

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