[Rpm-maint] [rpm-software-management/rpm] Implement support for literal and one-shot macro modifiers (PR #4129)

[Panu Matilainen]

pmatilai left a comment (rpm-software-management/rpm#4129)

There's no doubt some room for speculation around the exact semantics of various corner-cases:
A %global literal macro is never expanded, but a one-shot %global macro is expanded twice: once at the time of definition as a regular %global does, and then once on the first actual use. 

The former seems obvious, the latter is more controversial, but I figured this could be useful in some of the intended %global use-cases: when defining a global macro inside a parametric macro, the body may need to be expanded once if it contains references to local macros. A normal global gets re-expanded afterwards on each use, and this is quite commonly relied on. And if there's a case for that, there could equally be a case for wanting to cache the time-of-use expansion as well. 

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