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

[Michael Schroeder]

Well, we don't need to allow %global.

Anyway, let's move a step back and talk about this issue. This is about one shot macros. Implementation wise this is not hard, it's more a question of syntax.

It would be nice to have the following options:
- literal: do not expand the macro when using it
- global: put macro in global namespace
- expand: expand macro right away
- once: cache expanded macro (this issue)

So %global is %define plus the global + expand flags.

Macro names can't start with a `-`, so we could make use normal options:
```
%global foo bar
%define -g -x foo bar
```

As next step can can discuss how we support this in the macro files ;)

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