ticket:9803: Change const input parameter to non-const

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33121 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8451: Remove UnicodeString static initializers


git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33122 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9718: Disable strict mode when building ufile with gcc

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33124 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9648: Added a note in What's new section in readme.html about the subclassing-API breaking change in BasicTimeZone.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33125 251d0590-4201-4cf1-90de-194747b24ca1