Clang C++20 compatibility: made operator== and operator!= friend functions#31

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JPenuchot:cpp20-fix

Commits on Jan 20, 2022

Turned operator== and operator!= members into friend functions for Clang C++20 compatibility
JPenuchot
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Added default constructor for non_copyable_thing that Clang doesn't generate in C++20 mode
JPenuchot
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