[Rpm-maint] [rpm-software-management/rpm] rpm-4.18.0 embeds build machine CPU count (Issue #2343)

[Bernhard M. Wiedemann]

While working on [reproducible builds](https://reproducible-builds.org/) for [openSUSE](https://en.opensuse.org/openSUSE:Reproducible_Builds), I found that the recent upgrade to rpm-4.18.0  
with #2047 / #1241 caused spec files with

```bash
make %{?_smp_mflags}
```

to embed the build machine CPU count into .src.rpm files, making them hard to bit-reproduce.
binary rpm files embed the .src.rpm header checksum, so suffer as well.

It might also introduce other hard-to-reproduce details, but I have not looked for these, yet.

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