[issue28818] simplify lookdict functions

[INADA Naoki]

INADA Naoki added the comment:

> Can you make the patch without the unnecessary variable name change from "value_addr" to "pvalue".  The former name is more communicative and is self-describing.

Done.
I have changed the variable name to distinguish `PyObject**` with `PyObject***`.
But there are no meaning for now because I removed all `PyObject ***`.

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Added file: http://bugs.python.org/file45682/simplify-lookdict2.patch

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