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merge revision(s) 43110,43155: [Backport #8768]

    * lib/tempfile.rb (Tempfile#unlink): finalizer is no longer needed
      after unlinking.  patched by by normalperson (Eric Wong) at
      [ruby-core:56521] [Bug #8768]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@43490 b2dd03c8-39d4-4d8f-98ff-823fe69b080e