[Rpm-maint] [rpm-software-management/rpm] Turn nrefs into atomic_int (PR #3370)

[Panu Matilainen]

> To me https://en.cppreference.com/w/cpp/atomic/atomic/operator_arith reads like the value returned from the ++ and -- operators are indeed obtained atomically:

Yes, that much is atomic. But the number of actual references can change between the returned information and the comparison, it's a separate instruction already. It's not like I eat this stuff for breakfast either, but AIUI handling this requires the atomic compare-exchange thing. Of the memory models I've no idea either.

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