[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

Yes it breaks compilation with gcc 4.3. Fixing these bugs are mostly
s/int/unsigned int. But some parts of code need Python wisdom :/ 

New patch attached adressing your comment.

Added file: http://bugs.python.org/file9207/overflow-error2.patch

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