OpenSSL::SSL::SSLSocket#verify_result returns wrong result for self-signed certs

[headius]

From http://jira.codehaus.org/browse/JRUBY-7049

See the following tests from Celluloid::IO
https://github.com/celluloid/celluloid-io/blob/master/spec/celluloid/io/ssl_socket_spec.rb#L105
On MRI, these return OpenSSL::X509::V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT as expected.
On JRuby, this returns 1, which does not seem to be even valid. (Note: this is not returning V_OK, so at least that much should be good)

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