merge revision(s) 40181: [Backport #8183]

	* lib/cgi/util.rb (CGI::unescapeHTML): fix Hexadecimal numeric character.
  [Bug #8183]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40315 b2dd03c8-39d4-4d8f-98ff-823fe69b080e