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

[Florian Festi]

Yes, this is just about `nrefs` and does not add thread safety for the content of the data types.

`--nrefs` decreases the nrefs and returns the new value atomically. As reaching 0 means no one has a reference it "can not" increase again. So checking the value later is fine. Note that we get a copy of the value returned from `--nrefs` so other changes to the `nrefs` attibute won't change the return value of the `--` operator.

So during the `--` operator the decision if made whether we need to free the instance. And we get a copy of that decision. So the *Free() function is not racy.

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