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

[mkoncek]

I will add in a real-life scenario for which I could imagine a better way:
```spec
%global upstream_version 1.5.2-3
%global short_version %(echo %{upstream_version} | sed 's/-.*//')
```

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