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merges r31085 from trunk into ruby_1_9_2.¶

• parse.y (parser_encode_length): fix typo: the length of
  "-dos" and "-mac" is not 5 but 4.
  patched by James M. Lawrence [ruby-core:35476] fixes #4489

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31774 b2dd03c8-39d4-4d8f-98ff-823fe69b080e