[issue1717] Get rid of more refercenes to __cmp__

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Guido approved removing __builtin__.cmp() in 3.0.1.  It was supposed to
have been taken out but was forgotten.

With respect to the DRY principle, I disagree about its utility here. 
The code is so simple that it doesn't warrant cross-module
factorization.  It is a better goal to minimize dependencies.

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