[tz] Downstream use of 2021c

[Paul Eggert]

On 10/6/21 9:26 PM, Philip Paeps via tz wrote:
> 
> This is looking terribly fragmented.

Fragmented yes, terrible no. This sort of disagreement is reasonably 
common, as distros are understandably cautious about taking upstream 
patches. This was true even before the recent disagreement.

End users should not assume "if I keep my installations of distro X and 
distro Y up-to-date, they'll agree about every timestamp no matter how 
obscure". That's not true now, and it's never been true. It's not even 
true for different releases of the same distro, even if both releases 
are being maintained.