[issue20264] Update patchcheck to looks for files with clinic comments

[Zachary Ware]

Zachary Ware added the comment:

This could be taken a step further, following the lead of the whitespace fixing checks and just run clinic on files that need it.

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nosy: +zach.ware

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20264>
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