merge revision(s) 57492:

    test_queue.rb: fix portability

    * test/thread/test_queue.rb (test_queue_with_trap): fix
      portability.  use SIGINT instead of SIGUSR2 which is supported
      on not all platforms.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57894 b2dd03c8-39d4-4d8f-98ff-823fe69b080e