lib/time: update time zone files to version 2013g

This dataset is current as of Sep 30, 2013.

Fixes #6524

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/14570044

lib/time/update.bash

@@ -6,9 +6,11 @@
 # This script rebuilds the time zone files using files
 # downloaded from the ICANN/IANA distribution.
 
+# NOTE: As of Oct, 2013, the C files will not build on Macs but will build on Linux.
+
 # Versions to use.
-CODE=2013c
-DATA=2013c
+CODE=2013g
+DATA=2013g
 
 set -e
 rm -rf work