Give a more precise error message if a variable is re-used as cursor name in ecpg.

Michael Meskes <meskes@postgresql.org>

Commit: e01c6ce712d3db0ae1f2205d9dae1168f1da1f5d
Author: Michael Meskes <meskes@postgresql.org>
Date: 2010-03-31T08:45:18Z
Releases: 9.0.0
Give a more precise error message if a variable is re-used as cursor name in ecpg.

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