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c++20 removed several members of std::allocator, causing sparsehash to fail to build. a long-open (2021…) pr switches these to alternatives, so we fetch that pr and include it. this is relevant for gcc 16, which switches to c++20 as the default standard version. fedora has done the same thing: https://src.fedoraproject.org/rpms/sparsehash/blob/rawhide/f/165.patch