- The setting of "ENV{'TZ'}" doesn't affect the timezone
  used by MySQL Server on Windows.
- Explicitly set timezone to "+03:00" in test case before
  doing the calculatiosn to check that there is three hours
  difference between utc and local time.
(Magnus' fix)


mysql-test/r/func_time.result:
  Update test results
mysql-test/t/func_time.test:
  Set timezone to GMT-3, to make it possible to use "interval 3 hour"