ruby-build 20210726
* Ensure it is safe to remove the prefix path for TruffleRuby or error
* Only do clean_prefix_path for TruffleRuby and rename for clarity,
since the logic is now TruffleRuby-specific.
ruby-build 20210726
* Ensure it is safe to remove the prefix path for TruffleRuby or error
* Only do clean_prefix_path for TruffleRuby and rename for clarity,
since the logic is now TruffleRuby-specific.