message: [vcpkg] Removed unused template function.
diff: namespace vcpkg::Util
  {
  - template<class T>
  - constexpr std::add_const_t<T>& as_const(T& t) noexcept
  - {
  - return t;
  - }
  - template<class T>
  - void as_const(const T&&) = delete;
  -
  template<class Container>
  using ElementT =
  std::remove_reference_t<decltype(*std::declval<typename std::remove_reference_t<Container>::iterator>())>;
  