After CODETOOLS-7903760 re-introduced `jtdiff` as a feature of `jtreg`, the Makefiles should be merged into a single one: copy relevant parts from `jtdiff.gmk` into `jtreg.gmk` and delete `jtdiff.gmk`.
- relates to
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CODETOOLS-7903760 Revert "7903622: Remove support for `jtdiff`"
- Resolved