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
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/93513d1b6559b2d0805f0b02d312ee550e3d010b

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

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