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Make RbConfig::CONFIG values mutable [Bug #16738] As `RbConfig.expand` modifies the argument and involved `CONFIG` values, its values should be mutable. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67872 b2dd03c8-39d4-4d8f-98ff-823fe69b080e