[tz] tzdata2016g missing version information

[Paul Eggert]

On 10/04/2016 09:00 AM, Deborah Goldsmith wrote:
> The version number is available in the name of the tar archive. Admittedly, that’s not the most convenient way to get it, but it’s there.

Yes, that's been true for a while, so installers should be able to rely 
on it.

As for the 'version' file, it's been a while and as nobody has come up 
with anything better and simpler, attached is a proposed change to 
document the status quo since 2016h so that it can be relied on.

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