[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)

Discussed the syntax with @dmnks today and came up with a solution that fits nicely into the macro file syntax, and since it works there it can be also used in %define/%global without any further code: add an optional `<modifiers>` field to the syntax, eg:

`%_pyver<o> %(python3 --version)`

It combines without parametrics too:
`%mymacro(ab:f)<c> ....`

We could also support long names (perhaps later on), eg
`%mymacro<oneshot,const> ...`

"const" is a work-in-progress name for #2314 which suffers from the same issue: the implementation is easy enough, the syntax has been the blocker. 

`<>` is used for the modifier because `[]` we might one day want to use that for arrays, and `{}` is already used in the macro body, so this makes these stand out. In the long name version, `,` is the separator to avoid confusion with parametric arguments using `:` and space is what separates the name part from the body, so spaces seem unappropriate.

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