[issue1631171] implement warnings module in C

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

On another note, the warnings module should be made to work with or 
without _warnings. that way IronPython, Jython, and PyPy won't have to re-
implement stuff. This also means that test cases need to be changed to 
test this.

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priority: normal -> high

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