[issue2337] Backport oct() and hex() to use __index__

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

I don't assume there are too many people using oct() and hex() with
custom types anyway :)

Since PyNumber_ToBase and the new oct() format octal numbers with "0o"
instead of "0", I still think it's better if you need to import the new
oct() from future_builtins. For hex(), I have no preference.

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