ticket:9996: Disable call to isspace on zos

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33349 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9975: Update test for new expected result, remove timebomb

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33350 251d0590-4201-4cf1-90de-194747b24ca1