Fix TestProcess#test_setsid
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37829 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Fix TestProcess#test_setsid
doesn't work on all environments. EnvUtil.rubybin would be suitable.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37829 b2dd03c8-39d4-4d8f-98ff-823fe69b080e