[issue22156] Fix compiler warnings

[STINNER Victor]

STINNER Victor added the comment:

> Victor, your patch fixes most of the pesky warnings. However you left one warning ...

Yes, my patch is uncomplete. Don't hesitate to post a new patch or
complete mine. I'm in holliday, I'm not going to update it before a
few weeks.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22156>
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