ticket:8464: Apply Markus' changes. _COUNT -> _UNIT_COUNT.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34684 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: Merge r34629 to r34684 from trunk.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34685 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: Add relative date formatting.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34686 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: Try to fix broken build.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34687 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: Fix copyright.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34688 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: Try to fix broken build.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34689 251d0590-4201-4cf1-90de-194747b24ca1