CMake adjustments after unit test refactoring

* TARGET_RUNTIME_DLLS requires CMake 3.21
* Hide compiiler warnings in Visual Studio

ApplicationLibCode/UnitTests/CMakeLists.txt

@@ -1,5 +1,10 @@
 # ResInsight unit tests
 
+if(MSVC)
+  # TARGET_RUNTIME_DLLS requires 3.21
+  cmake_minimum_required(VERSION 3.21)
+endif(MSVC)
+
 set(SOURCE_UNITTEST_FILES
     ${CMAKE_CURRENT_LIST_DIR}/cvfGeometryTools-Test.cpp
     ${CMAKE_CURRENT_LIST_DIR}/Ert-Test.cpp
@@ -204,6 +209,8 @@ if(MSVC)
             $<TARGET_FILE_DIR:ResInsight-tests>
     COMMAND_EXPAND_LISTS
   )
+
+  set_target_properties(ResInsight-tests PROPERTIES COMPILE_FLAGS "/wd4190")
 endif(MSVC)
 
 add_test(NAME ResInsight-tests COMMAND ResInsight-tests)