Obsolete makefiles should be removed before the next ICU release.
Serveral Makefiles are currently being preserved in the ICU data directories which are commented as needing removal. See:
When this is done the build-icu-data.xml files should be updated.
If people are sure this is safe to do, sure. Unless people point me at more files I’ll just delete these 2 (since they are listed explicitly as special in the new Ant file).
Are you proposing to do this by Monday?