skip SEGV test if RUBY_ON_BUG is specified

test/-ext-/bug_reporter/test_bug_reporter.rb

@@ -4,6 +4,8 @@ require 'tmpdir'
 
 class TestBugReporter < Test::Unit::TestCase
   def test_bug_reporter_add
+    skip if ENV['RUBY_ON_BUG']
+
     description = RUBY_DESCRIPTION
     description = description.sub(/\+JIT /, '') if RubyVM::MJIT.enabled?
     expected_stderr = [