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test_rubyoptions.rb: locale name

• test/ruby/test_rubyoptions.rb: try locale encoding name.
  [ruby-core:67109] [Bug #10643]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49091 b2dd03c8-39d4-4d8f-98ff-823fe69b080e