[issue1771] Remove cmp parameter to list.sort() and builtin.sorted()

[Guido van Rossum]

Guido van Rossum added the comment:

> After more thought, I would like to make one more change and require the
> arguments to be keywords such as sort(key=str.lower) but not
> sort(str.lower).

Works for me. (To be honest I thought key was already required to be a
keyword. :-)

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