Comment 7 for bug 1734967

At code inspection I have strong believe this commit is the one changing the behaviour between comment #2 (America/Sao_Paulo) and comment#6 (UTC)

* 8e3260376c Update timezonemap.h, which needs to match

commit 8e3260376c65b762a51eee7c30ab560dadefa1f6
Author: Derick Rethans <email address hidden>
Date: Tue Oct 24 14:55:13 2017 +0100

    Update timezonemap.h, which needs to match the bundled TZ db

...
- { "wgst", 1, -7200, "America/Godthab" },
- { "wgt", 0, -10800, "America/Godthab" },
...

$ git tag --contains 8e3260376c
php-7.0.26
php-7.0.26RC1
php-7.1.12
php-7.1.12RC1
php-7.2.0
php-7.2.0RC5
php-7.2.0RC6

It seems like this update has been backported in upstream 7.0, 7.1, ... ~1month ago.

This would possibly need an SRU to adapt our different PHP package version where it applies to stay align with new tzdata package.

- Eric