[issue15535] Fix pickling efficiency of named tuples in 2.7.3

[Raymond Hettinger]

Raymond Hettinger 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.

In 3.3, the __dict__ attribute was there from the outset and was advertised in the docs, so it made more sense to leave it in and just suppress its inclusion in pickling.

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