misc: update timezone database to IANA 2016a

Fixes #14202

Change-Id: Ia6dccecb1b9b3f6c0838c99090e6ddf1ad43303c
Reviewed-on: https://go-review.googlesource.com/19175
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

lib/time/update.bash

@@ -8,8 +8,8 @@
 # Consult http://www.iana.org/time-zones for the latest versions.
 
 # Versions to use.
-CODE=2015g
-DATA=2015g
+CODE=2016a
+DATA=2016a
 
 set -e
 rm -rf work