Upgrade to tzdata2012f.

This release reflects the following change circulated on the tz
mailing list:

  * australasia (Pacific/Fiji): Fiji DST is October 21 through January
    20 this year.  (Thanks to Steffen Thorsen.)

Change-Id: Ie21ea791ff5191264967aff685cbfa5c73f1fa5c
diff --git a/libc/zoneinfo/zoneinfo.version b/libc/zoneinfo/zoneinfo.version
index f9e9d44..18a0c39 100644
--- a/libc/zoneinfo/zoneinfo.version
+++ b/libc/zoneinfo/zoneinfo.version
@@ -1 +1 @@
-2012e
+2012f