Added Joachim's changes for MinGW.

Michael Meskes <meskes@postgresql.org>

Commit: 9897e35c5666e5384ca0dc49456b55a014b15d96
Author: Michael Meskes <meskes@postgresql.org>
Date: 2006-09-26T07:56:57Z
Releases: 8.2.0
Added Joachim's changes for MinGW.
Added SET DATESTYLE to one test so the output format is defined.

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