[Rpm-maint] [rpm-software-management/rpm] Parallelize file processing (#1185)

[Michal Domonkos]

So I did some more testing and it turns out, after all, that rpmbuild only spends a tiny fraction of time in the `processPackageFiles()` function; dependency generators (kmod.prov in particular) are a much bigger bottleneck but also vastly trickier to parallelize.

The speed improvements that I observed a while ago in https://github.com/rpm-software-management/rpm/issues/1185#issuecomment-617147116 were most likely just a false positive due to some internal data inconsistency caused by the "naive" patch that I tested with.

With that said, I'm closing this ticket as there's no point in putting much effort in this. OTOH, parallel execution of dependency generators (`rpmfcGenerateDepends()`) is something where real improvements could be made (in the case of kernel, the cumulative runtime of these is in the order of hunderds of seconds). But that would be tracked in a separate issue.

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