[Rpm-maint] [rpm-software-management/rpm] Triple operator for conditional shortcut (#115)

[pavlinamv]

> While we're thinking about extending the conditional macro syntax, here's another thing to consider:

> The current ? test is only for (non-)existence of macro, which is extremely limiting. We could easily make the spec %if expression parser available to macro engine, which would give a whole new level of power to macros.

Please, what it the expected be gain from it?

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