Use EnvUtil.rubybin instead of Gem.ruby
[ruby-core:50943] [Bug #7581]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Use EnvUtil.rubybin instead of Gem.ruby
[ruby-core:50943] [Bug #7581]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e