ticket:10434: Relaxed the check condition for DST amount from 1 hour to 2 hours. tzdata2014b added Antarctica/Troll with a recurrent DST rule with 2 hour daylight saving.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35531 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10434: tzdata2014b to ICU4C

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35533 251d0590-4201-4cf1-90de-194747b24ca1