[tz] [PROPOSED] zic option for including data from a certain year onward

[Paul Eggert]

Thanks for suggesting that. I looked into the issue, and it can be a trickier to 
truncate the output because truncation also affects things like the default time 
type and the TZ string, and truncation might affect the 32-bit data (which is 
already truncated) differently from the 64-bit data. I wrote a different 
implementation, which supports truncating newer timestamps as well, as per 
Internet RFC 8536. Please give the attached proposed patch a try.
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