Update to 2024bgtz from https://github.com/JodaOrg/global-tz
o Improve historical data for Mexico, Mongolia, and Portugal.
o System V names are now obsolescent.
o The main data form now uses %z.

zoneinfo: install tzdata.zi and leap-seconds.list

Build and install the tzdata.zi file and build the leapseconds file
from leap-seconds.list (installing both versions). Third-party
software now exp

zoneinfo: install tzdata.zi and leap-seconds.list

Build and install the tzdata.zi file and build the leapseconds file
from leap-seconds.list (installing both versions). Third-party
software now expects these files to be installed. OK sthen@ deraadt@

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