[tz] Getting current tzdb version in use

Paul Eggert eggert at cs.ucla.edu
Thu Jul 19 23:29:31 UTC 2018

Howard Hinnant wrote:
> vendors can easily add version files to their compiled binary databases (as Apple already does for macOS, iOS and watchOS).

How does that work, exactly? I don't have easy access to any of those systems. 
Is it documented anywhere?

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