[tz] mktime() clarification

[Paul Eggert]

On 3/25/24 12:16, Dag-Erling Smørgrav via tz wrote:
> it seems to me
> that the only reliable way to determine whether mktime() succeeded,
> within the bounds of the aforementioned standards, is to set tm_wday or
> tm_yday to an out-of-bounds value (e.g. -1) prior to calling mktime()

That's what I do, and it works portably on all platforms I know of. In 
contrast, I doubt whether the errno=0 trick is portable.

I installed the attached proposed patch to the documentation.
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