[Rpm-maint] [rpm-software-management/rpm] RFE: optional one-shot/cached macro expansion (#1155)

[Panu Matilainen]

pmatilai left a comment (rpm-software-management/rpm#1155)

So combining the newer needs with the older stuff in this topic, we have something like:
- `c`onst: not overridable (issues #2314 and #4091)
- `e`xpand: expand macro right away
- `g`lobal: put macro in global namespace
- `l`iteral: do not expand the macro when using it
- `o`nce: cache expanded macro (this issue)

But "expand" can't be valid in macro files (reading a macro file must not execute macros), and "global" would seem odd as a macro modifier, it doesn't make sense in a macro file and elsewhere you could already use %global. So I'm going to leave those two out for now at least.

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