Remove use of deprecated Autoconf define

Peter Eisentraut <peter@eisentraut.org>

Commit: 4d7e5a5db01edaff749555220aa41eb35be06799
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-10-07T14:47:23Z
Releases: 13.0
Remove use of deprecated Autoconf define

Change from HAVE_TM_ZONE to HAVE_STRUCT_TM_TM_ZONE.

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