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

[Florian Festi]

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:

```
    operator++() performs atomic pre-increment. Equivalent to return fetch_add(1) + 1;.
    operator++(int) performs atomic post-increment. Equivalent to return fetch_add(1);.
    operator--() performs atomic pre-decrement. Equivalent to return fetch_sub(1) - 1;.
    operator--(int) performs atomic post-decrement. Equivalent to return fetch_sub(1);. 
```

But then there is all this talk about fences and memory_order that makes my head spin. So what do I know?

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