message: Try to get around unresolved symbol on Windows
  See here:
diff: @@ -4,3 +4,7 @@ set(gtest_disable_pthreads ON)
  set(CMAKE_POLICY_DEFAULT_CMP0042 NEW)
  add_subdirectory(googletest EXCLUDE_FROM_ALL)
  +
  +if(WIN32 AND BUILD_SHARED_LIBS)
  + target_compile_definitions(gtest_main INTERFACE GTEST_LINKED_AS_SHARED_LIBRARY=1)
  +endif()
  