WSADuplicateSocketW, WSAEnumNameSpaceProviders{A,W}, WSAGetQOSByName,
WSAGetServiceClassInfo{A,W}, WSAGetServiceClassNameByClassId{A,W},
WSALookupServiceEnd, WSALookupServiceNext{A,W},
WSAProviderConfigChange,  WSASetService{A,W}, WSCEnableNSProvider,
WSCGetProviderPath, WSCInstallNameSpace,  WSCWriteProviderOrder.
Implementations for WSANtohl, WSANtohs, WSASocketA->W crosscall.
Avoid NULL dereferences in WSAStringToAddress{A,W} and
WSAAddressToString{A,W}.