This test replicates what Microsoft-MPI (https://github.com/microsoft/Microsoft-MPI/tree/master/src) and its backend NetworkDirect (https://github.com/microsoft/NetworkDirect/blob/master/src/ndutil/ndfrmwrk.c...) depend on.
-- v2: ws2_32: Return a socket from WSAProviderConfigChange() stub. ws2_32/tests: Add a simple test for WSAProviderConfigChange().