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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