[Rpm-maint] [rpm-software-management/rpm] Introduce symbol versioning to all rpm libraries (PR #4255)

[Michal Domonkos]

dmnks left a comment (rpm-software-management/rpm#4255)

I'm still not super excited about scattering the visibility info across header files when we have it neatly packed in a set of text files already. If versioning being an ELF-only (non-musl) thing is the sole reason for that duplication, I'm thinking: Couldn't we pre-process the version files at configure time by only inserting a version label conditionally? A version file without a version label seems to [fulfill the same role](https://stackoverflow.com/a/21845178) as the per-symbol visibility attributes. Something like:

```
@VERSION_LABEL@ {
    global:
        ...
    local:
        ...
}
```

where `@VERSION_LABEL@` would be replaced with e.g. `LIBRPMBUILD_6.2` if enabled in the cmake config?

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