[tz] Undoing the effect of the new alike-since-1970 patch

[Paul Eggert]

On 9/20/21 8:15 AM, Almaz Mingaleev wrote:
> Thanks, Paul. It works fine.

Thanks for checking. As the "Revert May patch to zone.tab" patch fixes 
your problems, and there doesn't seem to be any objection to it and I 
doubt there would be any, I installed it into the development database 
on GitHub.