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

[Panu Matilainen]

To elaborate a bit further... so what rpm really needs, much more than the triple-operator for existence, is a macro syntax that supports the generic form:
```
<expression> ? <true case> [: <false case> ] 
```

<expression> is an arbitrary expression evaluated by rpmExprBool() (ie the same as spec %if), <true case> is output when expression is true, *optionally* followed by a false case. The macro existence test (triple syntax or not) could be seen as a specific sub-case of this all.

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