[Bug 2085147] Re: Wrong timezone detection (always UTC)

[Benjamin Drung]

I can reproduce the failure on Ubuntu, but it works on Debian unstable:

```
# dpkg -s tzdata | grep ^Version
Version: 2024b-3
# dpkg-reconfigure tzdata
[...]
Current default time zone: 'Europe/Berlin'
Local time is now:      Wed Oct 23 10:47:35 CEST 2024.
Universal Time is now:  Wed Oct 23 08:47:35 UTC 2024.

# ls /etc/localtime -l
lrwxrwxrwx 1 root root 33 Oct 23 10:47 /etc/localtime -> /usr/share/zoneinfo/Europe/Berlin
# ./a.out 
2024-10-23 10:52:41.398553339 CEST
```

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https://bugs.launchpad.net/bugs/2085147

Title:
  Wrong timezone detection (always UTC)

Status in tzdata package in Ubuntu:
  New

Bug description:
  With tzdata 2024b-1ubuntu1 (plucky-proposed), the timezone is wrongly
  detected to be UTC, no matter what I do.

  This is working fine with 2024a-4ubuntu1, which is what was released
  in Oracular.

  Simple reproducer:
  ```cpp
  #include <chrono>
  #include <iostream>

  int main() {
      const std::chrono::zoned_time cur_time{ std::chrono::current_zone(),
                                              std::chrono::system_clock::now() };
      std::cout << cur_time << '\n';
  }
  ```
  Compiled with `g++ -std=c++20 main.cpp`

  ```
  $ ./a.out
  2024-10-21 16:14:17.489489001 UTC
  $ dpkg-query -W tzdata
  tzdata	2024b-1ubuntu1
  $ sudo apt install tzdata/oracular
  [...]
  $ dpkg-query -W tzdata
  tzdata	2024a-4ubuntu1
  $ ./a.out
  2024-10-21 18:16:25.554620585 CEST
  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: tzdata 2024b-1ubuntu1
  ProcVersionSignature: Ubuntu 6.8.0-45.45-generic 6.8.12
  Uname: Linux 6.8.0-45-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.30.0-0ubuntu4
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: sway
  Date: Mon Oct 21 14:11:36 2024
  InstallationDate: Installed on 2023-08-02 (446 days ago)
  InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
  PackageArchitecture: all
  ProcEnviron:
   LANG=fr_FR.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/zsh
   TERM=alacritty
   XDG_RUNTIME_DIR=<set>
  SourcePackage: tzdata
  UpgradeStatus: Upgraded to plucky on 2024-06-12 (131 days ago)

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