[Rpm-maint] [rpm-software-management/rpm] Host specific %_install_langs affects --root <customdir> installation (Issue #2623)

[Pavel Raiskup]

E.g. Red Hat UBI images contain:

```
[root at c5436d2dbebf /]# cat /etc/rpm/macros.image-language-conf 
%_install_langs C.utf8
```

This though affects `dnf --installroot` using `rpm --root`:
```
$ podman run --privileged -it --rm registry.access.redhat.com/ubi9/ubi
[root at 85d37140e490 /]# cat /etc/rpm/macros.image-language-conf
%_install_langs C.utf
[root at 85d37140e490 /]# dnf --installroot /tmp/customroot install tar -y
...
Complete!
[root at 85d37140e490 /]# find /tmp/customroot/usr/share/locale/
/tmp/customroot/usr/share/locale/
/tmp/customroot/usr/share/locale/locale.alias
```

With removed macros file:
```
[root at 85d37140e490 /]# rm /etc/rpm/macros.image-language-conf 
rm: remove regular file '/etc/rpm/macros.image-language-conf'? yes
[root at 85d37140e490 /]# dnf --installroot /tmp/customroot2 reinstall tar -y
...
Complete!
[root at 85d37140e490 /]# find /tmp/customroot2/usr/share/locale/
/tmp/customroot2/usr/share/locale/
/tmp/customroot2/usr/share/locale/doi
/tmp/customroot2/usr/share/locale/doi/LC_MESSAGES
/tmp/customroot2/usr/share/locale/ig
/tmp/customroot2/usr/share/locale/ig/LC_MESSAGES
/tmp/customroot2/usr/share/locale/hus
/tmp/customroot2/usr/share/locale/hus/LC_MESSAGES
/tmp/customroot2/usr/share/locale/fro
/tmp/customroot2/usr/share/locale/fro/LC_MESSAGES
...
```

This is causing [trouble with EPEL8/EPEL9 mock builds after switching to "bootstrap image" by default](https://github.com/rpm-software-management/mock/issues/1181).

I'm curious whether this is an isolation bug in RPM or not.  And if there's known guidance on what to do in such a case (should Mock try hard to work-around this, or should packages rather not require all langpacks at build-time?).

Is this a proper place to discuss this?

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