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

[Michal Domonkos]

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

> I'm just wondering if that should be left for the macro creator afterall, ie `mymacro<o>` would actually keep expanding on each use like the result of a `%global` does, and `mymacro<ol>` would really only expand once. The ability to differentiate seems kinda handy, but then I smell potential for lot of confusion as well.

This almost calls for a slightly different (more granular) set of modifiers:

- `mymacro<z>`: expands on each use (deferred, or *lazy* expansion), like the result of `%global`
- `mymacro<m>`: expands on definition but caches (*memoizes*) the result
- `mymacro<zm>`: lazy, memoized expansion (i.e what the original one-shot modifier does)

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