[Rpm-maint] [rpm-software-management/rpm] unshare plugin fails in an empty chroot (Issue #3187)

[Panu Matilainen]

**Describe the bug**
unshare plugin fails in various ways when installing to an empty chroot.

**To Reproduce**
Steps to reproduce the behavior:
1. Install F41, install rpm-plugin-unshare
2. dnf --installroot=/srv/test --disablerepo="*" --enablerepo="rawhide" install rpm

**Expected behavior**
No errors encountered.

**Output**
Errors like this repeated for various scriptlets:
>  [...]
 Running scriptlet: p11-kit-trust-0.25.3-4.fc40.x86_64                   52/77 
error: failed to mount private /: Invalid argument
error: Plugin unshare: hook scriplet_fork_post failed
warning: %post(p11-kit-trust-0.25.3-4.fc40.x86_64) scriptlet failed, exit status 126
[...]

**Environment**
 - OS / Distribution: Fedora 41
 - Version: rpm >= 4.20

**Additional context**
Didn't investigate, but it's possible that unshare simply requires /proc to be mounted at the, in which case the plugin or parts of it needs to be disabled if /proc isn't there.

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