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Change tzdata release to use rearguard data

Description

Current tzdata build script uses the stock tzdata files, with local override (icuzones).
ICU TC prefers to use rearguard data. Update the build script, remove some local override rules in icuzones.

Environment

Status

Assignee

Yoshito Umaoka

Reporter

Yoshito Umaoka

Components

Fix versions

Priority

critical