ticket:10051: initOnce and Mutex, work in progress.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33618 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10051 InitOnce, platform tweaks.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33625 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10051 One Time initialization, work in progress.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33626 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10051 One Time initialization, work in progress.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/andy@33627 251d0590-4201-4cf1-90de-194747b24ca1