[issue6151] Make PyDescr_COMMON conform to standard C

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

The patch looks fine in principle. I believe many of the macro
applications are unnecessary, because the type of the variables being
accessed is already PyDescrObject.

Not sure whether this can be applied to 3.1 still.

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