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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