[Rpm-maint] [rpm-software-management/rpm] Implement %foreach builtin to iterate over arguments (PR #1828)

[Panu Matilainen]

> And we need to define if the body expansion should use the same macro level or not. I.e. if how %define in the body should work.

Any thoughts on that? My gut feeling says %foreach should simply give identical results to doing the same manually, but if that misses some useful case...

On a somewhat related note, I suspect some would expect to be able to use parametric macro as the second `%foreach` argument, which currently doesn't give particularly meaningful results:

> [pmatilai🎩︎localhost rpm]$ ./rpm --define "dofoo >%{1}<" --define "iter hello world %{quote:good bye}" --eval "%{foreach iter %dofoo}"
>hello<>world<>good bye<
[pmatilai🎩︎localhost rpm]$ ./rpm --define "dofoo() >%{1}<" --define "iter hello world %{quote:good bye}" --eval "%{foreach iter %dofoo}"
>%{1}<>%{1}<>%{1}<


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