Fixes to the update-tzdata.py tool

We build one too many times. Creating a missing directory
is sufficient.

The tz2icu needs some files in the CWD. Added symlinks.

Bug: 19230091
(cherry-pick of commit 0662c3e5b33840e19f4c14b85bf619c33b3a0d0f)
Change-Id: Ie21d848f1b776ec745473b9122e003fdf0acf105
1 file changed