[issue24053] Define EXIT_SUCCESS and EXIT_FAILURE constants in sys

[Alexander Belopolsky]

Changes by Alexander Belopolsky <alexander.belopolsky at gmail.com>:


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nosy: +ethan.furman, mark.dickinson, serhiy.storchaka, terry.reedy

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24053>
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