[issue20148] Convert the _sre module to use Argument Clinic

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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dependencies: +Argument Clinic doesn't support named constants as default values, Argument Clinic: broken support for 'O!'

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20148>
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