re-en: Initialize Winsock with library load

Utest/upnplib/CMakeLists.txt

@@ -1,5 +1,5 @@
 # Copyright (C) 2022+ GPL 3 and higher by Ingo Höft, <Ingo@Hoeft-online.de>
-# Redistribution only with this Copyright remark. Last modified: 2024-06-18
+# Redistribution only with this Copyright remark. Last modified: 2024-06-19
 
 cmake_minimum_required(VERSION 3.18)
 include(../../cmake/project-header.cmake)
@@ -38,6 +38,7 @@ add_test(NAME ctest_upnptools-ust COMMAND test_upnptools-ust --gtest_shuffle
 # =======
 add_executable(test_netaddr-ust
     test_netaddr.cpp
+    ${UPNPLIB_SOURCE_DIR}/src/net/socket.cpp
 )
 target_link_libraries(test_netaddr-ust
     PRIVATE upnplib_static
@@ -69,6 +70,7 @@ add_test(NAME ctest_sockaddr-ust COMMAND test_sockaddr-ust --gtest_shuffle
 # =========
 add_executable(test_addrinfo-ust
     test_addrinfo.cpp
+    ${UPNPLIB_SOURCE_DIR}/src/net/socket.cpp
 )
 target_include_directories(test_addrinfo-ust
     PRIVATE ${UPNPLIB_PROJECT_SOURCE_DIR}