[issue19569] Use __attribute__((deprecated)) to warn usage of deprecated functions and macros

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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nosy: +ZackerySpytz
versions: +Python 3.8 -Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19569>
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