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with the merged trunk as of #12800 we should be able to remove icudata.jar from icu4j so that when building from source, the icu4j data comes from icu4c
Made obsolete / duplicated by the work to convert Ant to Maven in https://unicode-org.atlassian.net/issues/ICU-22324
= TODOs =
cleanup general hackiness
top level build.xml should be rethought
clean up the stray `./tmp` dir at top level
think harder about out of source builds
build under windows ( sublaunch nmake/msvcbuild ? )
build DebugUtilitiesData and any other manually copied thing
with the merged trunk as of #12800 we should be able to remove icudata.jar from icu4j so that when building from source, the icu4j data comes from icu4c