Remove propagate_on_* types and is_always_equal

include/metall/utility/fallback_allocator_adaptor.hpp

@@ -55,10 +55,6 @@ class fallback_allocator_adaptor {
  typename primary_allocator_type::const_void_pointer;
  using difference_type = typename primary_allocator_type::difference_type;
  using size_type = typename primary_allocator_type::size_type;
- using propagate_on_container_copy_assignment = std::true_type;
- using propagate_on_container_move_assignment = std::true_type;
- using propagate_on_container_swap = std::true_type;
- using is_always_equal = std::false_type;
 
  /// \brief Makes another allocator type for type T2
  template <typename T2>
@@ -205,15 +201,6 @@ class fallback_allocator_adaptor {
  }
  }
 
- /// \brief Obtains the copy-constructed version of the allocator a.
- /// \param a Allocator used by a standard container passed as an argument to a
- /// container copy constructor. \return The allocator to use by the
- /// copy-constructed standard containers.
- fallback_allocator_adaptor select_on_container_copy_construction(
- const fallback_allocator_adaptor &a) {
- return fallback_allocator_adaptor(a);
- }
-
  // ---------- This class's unique public functions ---------- //
  primary_allocator_type &primary_allocator() { return m_primary_allocator; }