The America/Los_Angeles time zone is already enforced for test262
Travis CI jobs but that doesn't guarantee the correctness of
locally executed tests. So, this patch moves the setting of the
`TZ` environment variable from `.travis.yml` to `run-tests.py`.
The date-related tests in the jerry test suite also rely on a time
zone (UTC). Thus, `TZ` is forced for those tests, too.
JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu