ticket:10253 port 8474 fractional plurals to ICU4C


git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33911 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10253 correct branch name.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33912 251d0590-4201-4cf1-90de-194747b24ca1