Blind attempt to fix _configthreadlocale() failures on MinGW.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: b620cf2d47625280e631127ae7202e798257647d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-01-24T03:46:57Z
Releases: 11.2
Blind attempt to fix _configthreadlocale() failures on MinGW.

Apparently, some builds of MinGW contain a version of
_configthreadlocale() that always returns -1, indicating failure.
Rather than treating that as a curl-up-and-die condition, soldier on
as though the function didn't exist.  This leaves us without thread
safety on such MinGW versions, but we didn't have it anyway.

Discussion: https://postgr.es/m/d06a16bc-52d6-9f0d-2379-21242d7dbe81@2ndQuadrant.com

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