test_queue.rb: fix portability
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_queue.rb: fix portability
portability. use SIGINT instead of SIGUSR2 which is supported
on not all platforms.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e