[Rpm-maint] [rpm-software-management/rpm] --undefine and Lua rpm.undefine() can undefine built-ins (Issue #4133)

[Panu Matilainen]

pmatilai created an issue (rpm-software-management/rpm#4133)

> rpm --undefine define --eval "%define foo bar" --eval "%foo"
%define foo bar
%foo

> rpm --eval "%{lua: rpm.undefine('getenv'); print(rpm.expand('%{getenv:HOME}'))}"
%{getenv:HOME}

Oops.

I do have a vague recollection about thinking rpm.undefine() shouldn't be using rpmPopMacro() like that, but having built-ins as actual macros kinda escalates this matter a bit 😅 and technically this is a regression from that change.

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