pgsql: Sync our copy of the timezone library with IANA release tzcode20

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Sync our copy of the timezone library with IANA release tzcode20
Date: 2017-04-30 19:14:40
Message-ID: E1d4uIq-0001o4-DU@gemulon.postgresql.org
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Sync our copy of the timezone library with IANA release tzcode2017b.

zic no longer mishandles some transitions in January 2038 when it
attempts to work around Qt bug 53071. This fixes a bug affecting
Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
now contains a workaround, useful when loading a file generated by
a buggy zic.

There are assorted cosmetic changes as well, notably relocation
of a bunch of #defines.

Branch
------
REL9_2_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/54aeb8d3e7c4f79c7dad1c255d9a509f8db83bf3

Modified Files
--------------
src/timezone/README | 2 +-
src/timezone/localtime.c | 73 +++++++++++++++++++++++++++++++++++-----------
src/timezone/pgtz.c | 9 +++---
src/timezone/private.h | 76 ++++++++++++++++++++++++++++++++++++------------
src/timezone/strftime.c | 11 +++++--
src/timezone/tzfile.h | 52 ---------------------------------
src/timezone/zic.c | 15 ++++++++--
7 files changed, 139 insertions(+), 99 deletions(-)

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