Make setlocale in ECPG test cases thread aware on Windows.

Michael Meskes <meskes@postgresql.org>

Commit: 38d7cb67f2e8798d6e0ecff8334345a3ae73b902
Author: Michael Meskes <meskes@postgresql.org>
Date: 2017-09-13T22:47:03Z
Releases: 10.0
Make setlocale in ECPG test cases thread aware on Windows.

Fix threaded test cases on Windows not to crash in setlocale() which can be
global or local to a thread on Windows.

Author: Christian Ullrich

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