[issue25283] Make tm_gmtoff and tm_zone available on all platforms

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

The problem of computing tm_gmtoff on platforms without it was solved by tzcode some time ago. [1,2]  Consider stealing some of their logic.

[1]: http://mm.icann.org/pipermail/tz/2014-September/021601.html
[2]: https://github.com/eggert/tz/commit/40b395e139

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<http://bugs.python.org/issue25283>
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