ticket:10483: update intra-ICU4C dependencies

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34925 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: Implement more changes from Markus' code review.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34929 251d0590-4201-4cf1-90de-194747b24ca1