git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@26358 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
empty hash when resolv.conf is not available. [ruby-core:27620]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@26358 b2dd03c8-39d4-4d8f-98ff-823fe69b080e