[tz] Wrong behaviour with truncated TZif files

[Paul Eggert]

On 2/17/22 05:09, Almaz Mingaleev via tz wrote:

> With a truncated TZif file it prints 331344000. With non-truncated one it
> prints 331372800.
> The latter is the right answer.

Thanks for reporting that. I installed the attached proposed patches; 
the first should fix it and the second updates a related comment.

This seems to be my weekend for fixing mktime bugs, as I fixed one in 
glibc yesterday involving time in Indiana <https://bugs.gnu.org/48085>.
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