message: Add SortedVector.cbegin() and .cend()
diff: @@ -42,6 +42,16 @@ namespace vcpkg
  return this->m_data.cend();
  }
  + iterator cbegin() const
  + {
  + return this->m_data.cbegin();
  + }
  +
  + iterator cend() const
  + {
  + return this->m_data.cend();
  + }
  +
  bool empty() const
  {
  return this->m_data.empty();
  