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extmk.rb: split notes

• ext/extmk.rb: split notes and echo per lines, for multiple lines
  messages. [ruby-core:79475] [Bug #13200]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57590 b2dd03c8-39d4-4d8f-98ff-823fe69b080e