(tz) Update Timezone Data to 2021d

The 2021d release of the tz code and data is available.

This release reflects the following changes, which were either
circulated on the tz mailing list or are relatively minor technical or
administrative changes:

   Briefly:
     Fiji suspends DST for the 2021/2022 season.
     'zic -r' marks unspecified timestamps with "-00".

   Changes to future timestamps

     Fiji will suspend observance of DST for the 2021/2022 season.
     Assume for now that it will return next year. (Thanks to Jashneel
     Kumar and P Chan.)

   Changes to code

     'zic -r' now uses "-00" time zone abbreviations for intervals
     with UT offsets that are unspecified due to -r truncation.
     This implements a change in draft Internet RFC 8536bis.

Here are links to the release files:

   https://www.iana.org/time-zones/repository/releases/tzcode2021d.tar.gz
   https://www.iana.org/time-zones/repository/releases/tzdata2021d.tar.gz
   https://www.iana.org/time-zones/repository/releases/tzdb-2021d.tar.lz

The following convenience links are also available, although they may
point to the previous release until the relevant caches are refreshed:

   https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
   https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
   https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz

Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.

Each release file has a GPG signature, which can be retrieved by
appending ".asc" to the above URLs. Copies of these signatures are
appended to this message.

This release corresponds to commit
4de3d7f2499328c97e652242a36fed9523741d12 dated 2021-10-15 13:48:18 -0700
and tagged '2021d' in the development GitHub repository at
<https://github.com/eggert/tz>.

Here are the SHA-512 checksums for the release files:

dbd7e3df02a11676600aa7efa14592feb2ac9ab5807b0d395e0c29ff1ed4a31580120287df9fe0c65a78162157dcd31d9fbe90a2a93bfd891d59ae3668a3adda
  tzcode2021d.tar.gz
e25e85679256cfa57072cc8902aad1ca1df5ddc4a06844ca38bd57c8b5ad386e38303654dc85525f4fb470a924db4deb3576827a14d3ff87f4a1c679414b95c9
  tzdata2021d.tar.gz
6ccb3ed6ebf35643cb49d503f18b7c66957de098f41870fd14ac37489b0931abd6d3e7bf5c2797e69f56f44b31ff9f9068ffa40f5aa29260ecda9d0aac878103
  tzdb-2021d.tar.lz

Here are the GPG digital signatures for the release files:

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PS. If your tzdata parser does not yet support negative DST offsets or
times past 24:00, or if it insists on a 'pacificnew' file that is no
longer present, this release's data entries can be turned into a
rearguard-format tarball that should work even with these older parsers.
This is intended to be a temporary transition aid for these parsers. To
generate a rearguard-format tarball, obtain the full distribution as
described above, and run the command 'make rearguard_tarballs' on a
development host. Or you can run 'make rearguard.zi' to generate a
single file that can be fed directly to a parser that works like 'zic'.