Revert "DO NOT MERGE Revert "Add the libcutils localtime_tz and mktime_t extensions to bionic.""

This reverts commit f4b34b6c3942be273ad7298a40be0d312b183aab.

The revert was only meant to apply to the jb-mr1 branch, but accidentally
leaked out into AOSP. This revert-revert gets AOSP master and internal
master back in sync.

Change-Id: I9a9b8acad8d43a822f1be6a295bc6f7ca502735f