[tz] tzdb-latest.tar.gz download issue

[Kim Davies]

Quoting Matt Johnson on Tuesday June 04, 2019:
> The lzip file, https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz redirects to https://data.iana.org/time-zones/tzdb-latest.tar.lz and downloads successfully.
> 
> The gzip file, https://www.iana.org/time-zones/repository/tzdb-latest.tar.gz redirects to https://data.iana.org/time-zones/tzdb-latest.tar.gz and then fails with a 404.
> 
> They both used to work, not sure what happened.

The gzip version has the data and code separated into two archives, namely: 

  https://data.iana.org/time-zones/tzcode-latest.tar.gz
  https://data.iana.org/time-zones/tzdata-latest.tar.gz

This behaviour has not changed. The lzip file was added later with the two
aggregated.

kim