(Fdump_emacs): If HAVE_TZSET and not
LOCALTIME_CACHE, call tzset to force a tz reload. (set_time_zone_rule): New decl. (dump_tz): New var. (main): Change TZ twice if the execution TZ happens to be the same as the dump TZ. (Fdump_emacs): Set TZ to unlikely value just before dumping.
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