ticket:9101: CollationFastLatin::compareUTF8()

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34160 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: support Collator::compareUTF8(const char *) in the base class, call that from ucol_strcollUTF8()

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34162 251d0590-4201-4cf1-90de-194747b24ca1