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merge revision(s) 66401: [Backport #15412]

    Move autoload to toplevel

    So that classes which uses Net::HTTP with https can use OpenSSL
    namespace for example exception classes like OpenSSL::SSL::SSLError.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@66964 b2dd03c8-39d4-4d8f-98ff-823fe69b080e