test_signal.rb: use SIGINT if needed
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41441 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_signal.rb: use SIGINT if needed
use SIGINT if SIGUSR1 is not available.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41441 b2dd03c8-39d4-4d8f-98ff-823fe69b080e