ticket:10719: fix problem with detecting timezone in non-english windows environment

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35732 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10522: Update tzcode readme in ICU

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35733 251d0590-4201-4cf1-90de-194747b24ca1