Fix descriptor output in ECPG.

Michael Meskes <meskes@postgresql.org>

Commit: a29b6c34209a54e570338fcec343b11286005685
Author: Michael Meskes <meskes@postgresql.org>
Date: 2014-01-09T14:51:23Z
Releases: 9.0.16
Fix descriptor output in ECPG.

While working on most platforms the old way sometimes created alignment
problems. This should fix it. Also the regresion tests were updated to test for
the reported case.

Report and fix by MauMau <maumau307@gmail.com>

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