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options.rb: include root for out-place build

• lib/rdoc/options.rb (RDoc#finish): include root path in include
  paths, to work in another directory than the source directory.
  [ruby-core:56282] [Bug #8712]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42300 b2dd03c8-39d4-4d8f-98ff-823fe69b080e