[rubygems/rubygems] Use the standard RUBY_ENGINE_VERSION instead of JRUBY_VERSION
https://github.com/rubygems/rubygems/commit/431d0aefdd
[rubygems/rubygems] Use the standard RUBY_ENGINE_VERSION instead of JRUBY_VERSION
https://github.com/rubygems/rubygems/commit/431d0aefdd