ticket:10968: More efficient implementation for scriptDisplayName(UScriptCode, ...) (C)

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36379 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10872: Fix en_US_POSIX word break for colon (C)

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36381 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10995: Delete old fNegPrefixPattern before creating new one by prepending minus to fPosPrefixPattern

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36382 251d0590-4201-4cf1-90de-194747b24ca1