message: Don't use __has_include in access.hpp if it's not available
diff: #include <initializer_list>
  #include <iterator>
  #include <limits>
  +#ifdef __has_include
  #if __has_include(<string_view>)
  #include <string_view>
  #endif
  +#endif
  #include <utility>
  #include <range/v3/range_fwd.hpp>
  