ticket:10842: Fix header test failures, fix no data test errors, and update file properties


git-svn-id: http://source.icu-project.org/repos/icu/icu@35982 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10842: Remove 54m1 tag


git-svn-id: http://source.icu-project.org/repos/icu/icu@35983 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10842: Retag 54m1 at r35982 trunk


git-svn-id: http://source.icu-project.org/repos/icu/icu@35984 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10983 Add failure checks to utext_clone().

git-svn-id: http://source.icu-project.org/repos/icu/icu@35985 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10983 Add failure checks to utext_clone().

git-svn-id: http://source.icu-project.org/repos/icu/icu@35986 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10976 Remove C++ null reference checks; they're undefined behavior.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35987 251d0590-4201-4cf1-90de-194747b24ca1