[tz] core dumps on AIX7.1 and HPUX11.31 and tzcode 2017B.

[Kees Dekker]

>Thanks for reporting that. I reproduced a core dump on AIX 7.1 and fixed 
>it by installing the attached patches into the development version on 
>GitHub. I don't have ready access to an HP-UX machine; perhaps you can 
>test the fix there.

It is a lot of work for me to test on HPUX, as I then must rollback my own changes in our product.
I'm glad to see that there is a fix, and I'm a little bit surprised that you could fix it, even with the minimal description provided by me. Thanks.

Kees