[Rpm-maint] [rpm-software-management/rpm] Define shell to use with %() (#1334)

[Panu Matilainen]

We don't want embedded Python now any more than we did back then.

A generic way of grabbing output from a command without invoking the shell in between I might consider, but nothing that adds language specifics into rpm, when we're in the process of getting rid of them alltogether. And I'm dubious about the cost of shell invocation being prohibitive when talking in the context of Python, Perl and the like - the biggest cost is invoking the language itself.

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