ecpg: Clean up some const usage

Peter Eisentraut <peter_e@gmx.net>

Commit: d41f510c807ce8b12c572196e2ae8f3817ac253a
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2012-03-02T18:51:29Z
Releases: 9.2.0
ecpg: Clean up some const usage

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