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There might be code out there that expect `ruby -v` to print only one line. Since MJIT shows +JIT in `ruby -v` and RUBY_DESCRIPTION, let's show +YJIT. The crash report doesn't show anything about MJIT, so adjust the test. The "test_ruby_version" test was unaware of RUBY_YJIT_ENABLE and so was failing when the variable is set and inherited into the children processes it spawns. Explicitly unset the variable in the test.