[Rpm-maint] [rpm-software-management/rpm] Introduce convenient %gsub macro to wrap Lua's string.gsub() (#1764)

[Panu Matilainen]

Oh. Auto-printing of returned values is one of those things that make you wonder how come nobody thought of this before :+1:

And yes, Lua only returns anything when explicit `return` is used so this should be safe, to the point that anything is.

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