[issue21121] -Werror=declaration-after-statement is added even for extension modules through setup.py

[Ned Deily]

Ned Deily added the comment:

Stefan, the patch LGTM although I sure wish we were removing some CFLAGS-related configuration variables rather than adding another.  But I don't have a better suggestion short of a comprehensive cleanup of all of them.

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stage:  -> commit review
versions: +Python 3.5

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<http://bugs.python.org/issue21121>
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