Add const qualifiers where they are accidentally cast away

Peter Eisentraut <peter_e@gmx.net>

Commit: 973e9fb294dc05a384ecae7623923ae53cb81806
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2012-02-28T10:42:08Z
Releases: 9.2.0
Add const qualifiers where they are accidentally cast away

This only produces warnings under -Wcast-qual, but it's more correct
and consistent in any case.

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