[Rpm-maint] [rpm-software-management/rpm] Codify built-in macro argument acceptance (#853)

[Panu Matilainen]

After poking around a bit, I ended up dropping the argument length checking entirely: it's not an *error* to echo an empty string, and similarly it is not an *error* to ask for dirname of an empty string. And so on - seems better left alone in reality. 

On-disk filenames cannot be empty so those cases could raise an error, but leaving that classification effort to some other day.

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