Make setlocale in ECPG test cases thread aware on Windows.

Michael Meskes <meskes@postgresql.org>

Commit: a772624b1d6b47ac00384901e1753f1d34b0cd10
Author: Michael Meskes <meskes@postgresql.org>
Date: 2017-08-26T10:57:21Z
Releases: 11.0
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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