message: [vcpkg] Avoid duplication of targets in the CMake message
diff: @@ -531,7 +531,9 @@ namespace vcpkg::Install
  while (next != last)
  {
  auto match = *next;
  - library_targets[find_package_name].push_back(match[1]);
  + auto& targets = library_targets[find_package_name];
  + if (std::find(targets.cbegin(), targets.cend(), match[1]) == targets.cend())
  + targets.push_back(match[1]);
  ++next;
  }
  }
  