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

[Larry Hastings]

Larry Hastings added the comment:

I've attached a script here that uses the new tweaked format of Clinic
blocks.  The new tweaked format isn't checked in yet--that change is being tracked with #20326.

Once that's checked in, though, the attached script will check that both the input and output blocks are unchanged and up-to-date, respectively.

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dependencies: +Argument Clinic should use a non-error-prone syntax to mark text signatures
Added file: http://bugs.python.org/file33765/detect.py

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