[issue15535] Fix pickling efficiency of named tuples in 2.7.3

[Anselm Kruis]

Anselm Kruis added the comment:

>> why the different fix for 3.3 
>
> I reverted the 2.7.4 addition of __dict__ rather than introduce more
> differences between point releases with possible unintended effects.

__dict__ was a 2.7.3 addition (changeset 26d5f022eb1a). Now unpickling of named tuples created by 2.7.3 and 2.7.4 fails.

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nosy: +anselm.kruis

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