ticket:9721: temporarily allow class Region to depend on DecimalFormat

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@33341 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9880: do not define a virtual destructor inline

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@33342 251d0590-4201-4cf1-90de-194747b24ca1