[bug #60952] NSTimeZone fail to deal with tzfile v2+

[Emmanuel Dreyfus]

Follow-up Comment #10, bug #60952 (project gnustep):

A quick update, I got success with the graft of NetBSD libc's localtime.c in
NSTimeZone. I do not post a patch for now because the code is awful, but at
least it produces the correct result:

TZ Europe/Paris
1981-01-16 TZ offset = 3600 (expects 3600)
1981-08-16 TZ offset = 7200 (expects 7200)
2021-01-16 TZ offset = 3600 (expects 3600)
2021-08-16 TZ offset = 7200 (expects 7200)

While there it is tempting to toss the part of NSTimeZone that deals with
transitions, since it is handled by the imported code.

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