Added variable handling for RETURNING clause to ecpg.

Michael Meskes <meskes@postgresql.org>

Commit: 98e4005efb1941c6422d6b8fbb5de27004149f7e
Author: Michael Meskes <meskes@postgresql.org>
Date: 2010-06-04T10:09:58Z
Releases: 9.0.0
Added variable handling for RETURNING clause to ecpg.

While the values were correctly returned they were not moved into C variables
as they should be.

Closes: #5489

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