[tz] Invalid tm handling in %s pattern in strftime

[Paul Eggert]

On 6/6/22 18:23, enh wrote:
> i think the safest choice for bionic is probably just "disable the new
> check and preserve the old behavior".

Yes, that sounds right.

Come to think of it, that's simpler (and arguably better) on all 
platforms. That is, if you give strftime a format containing %s, you 
must also pass a struct tm that came from a successful localtime call; 
otherwise behavior is undefined. In the undefined case tzdb strftime can 
simply output (time_t)-1 for %s.

Proposed patch attached and installed into the development repository. 
This doesn't affect tzdb itself, as tzdb never gets into this situation.
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