[issue1717] Get rid of more refercenes to __cmp__

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

Please put the PyUnicode_Compare() API back in there.

Removing __cmp__ really doesn't have anything to do with removing often
used helper functions for comparing certain object types and only
cripples the C API in a needless way.

Thanks.

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nosy: +lemburg

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