[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

With second patch now python builds without any overflow warnings, no
new regressions. Please test and/or review.

Only thing left is fixing Modules subdirectory.

Thanks.

Added file: http://bugs.python.org/file9238/fix-overflows-try2.patch

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