ticket:9979: Fix some memory clean up errors

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@33320 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9721: Update urename.h for 51 release

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@33321 251d0590-4201-4cf1-90de-194747b24ca1