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

Sync our copy of the timezone library with IANA release tzcode2016j.

This is a trivial update (consisting in fact only in the addition of
a comment). The point is just to get back to being synced with an
official release of tzcode, rather than some ad-hoc point in their
commit history, which is where commit 1f87181e1 left it.

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/492fe48f0113600e86449e3738a17d029dcfe144

Modified Files
--------------
src/timezone/README | 2 +-
src/timezone/zic.c | 5 +++++
2 files changed, 6 insertions(+), 1 deletion(-)

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