ticket:10051 UMutex, tweaks for Windows builds.

git-svn-id: http://source.icu-project.org/repos/icu/icu@33716 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: CollationBuilder::makeTailoredCEs()

git-svn-id: http://source.icu-project.org/repos/icu/icu@33717 251d0590-4201-4cf1-90de-194747b24ca1