[PATCH] Adjust tr1::_Hashtable to work with std::allocator in C++20

[Jonathan Wakely]

In C++20 std::allocator will no longer define construct and destroy
member functions, so using them needs to go via allocator_traits.
    
        * include/tr1/hashtable.h (tr1::_Hashtable::_M_allocate_node): Use
        __gnu_cxx::__alloc_traits for allocator construct function.
        (tr1::_Hashtable::_M_deallocate_node): Likewise for destroy function.

I forgot to include the necessary header, so there was another patch
to fix that:

        * include/tr1/hashtable.h: Add header for __gnu_cxx::__alloc_traits.

Tested x86_64-linux, committed to trunk.


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