[issue7528] Provide PyLong_AsLongAndOverflow compatibility to Python 2.x

[Case Van Horsen]

Case Van Horsen <casevh at gmail.com> added the comment:

I will work on documentation and test case patches.

Per comments on python-dev, there doesn't appear to be interest in
distributing forward compatibility files. I will update the bug report
with a slightly revised version of py3intcompat.c and just leave it at that.

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<http://bugs.python.org/issue7528>
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