fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Yanqin Jin 55a2105258 Make RocksDB codebase compatible with newer compilers like clang-12 (#9370) ... Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9370 GCC and newer clang, e.g. clang-12 treat `std::unique_ptr` slightly differently. For the following code ``` #include <iostream> #include <memory> #include <type_traits> struct A { std::unique_ptr<int> m1; }; int main() { std::cout << std::boolalpha; std::cout << std::is_standard_layout<A>::value << '\n'; return 0; } ``` GCC11(C++20) (tested on https://en.cppreference.com/w/cpp/types/is_standard_layout) will print "true", while newer clang, e.g. clang-12 will print "false". This breaks the usage of `offsetof()` on structs with non-static members of type `std::unique_ptr`. Fixing this by replacing the builtin `offsetof` with a trick documented at https://gist.github.com/graphitemaster/494f21190bb2c63c5516. Reviewed By: jay-zhuang Differential Revision: D33420840 fbshipit-source-id: 02bde281dfa28809bec787ad0f7019e85dd9c607		3 years ago
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rocksdb	Make RocksDB codebase compatible with newer compilers like clang-12 (#9370)	3 years ago