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Add FileUtils#cp_lr

• lib/fileutils.rb: Add FileUtils#cp_lr. This method creates hard links
  of each file from directory to another directory recursively.
  This patch is based on Thomas Sawyers and Zachary Scott.
  [Feature #4189] [ruby-core:33820]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62739 b2dd03c8-39d4-4d8f-98ff-823fe69b080e