Sync our copy of the timezone library with IANA release tzcode2017b.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 54aeb8d3e7c4f79c7dad1c255d9a509f8db83bf3
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-04-30T19:14:24Z
Releases: 9.2.21
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.

Files

PathChange+/−
src/timezone/localtime.c modified +56 −17
src/timezone/pgtz.c modified +5 −4
src/timezone/private.h modified +57 −19
src/timezone/README modified +1 −1
src/timezone/strftime.c modified +8 −3
src/timezone/tzfile.h modified +0 −52
src/timezone/zic.c modified +12 −3