[Rpm-maint] [rpm-software-management/rpm] Private /tmp directory for scriptlets (PR #2617)

[Panu Matilainen]

I'm not at all opposed to adding Linux-specific enhancements where they make sense, but we can't rely on them unconditionally. So at the very least this will need conditionalizing on the availability of the relevant unshare() etc facilities, but maybe also a way to disable at runtime even when built in. The need for one may not be obvious now, but pretty much every time I've added I've added  such a feature without an explicit disabler, I've regretted it later :sweat_smile: 

Another, stylistic nit is that the rpm codebase doesn't use `bool` and doing so in this one place only looks just odd, just use a plain old `int` instead. 

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