x509: fix handling of multiple URIs in Certificate#crl_uris #776
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The implementation of OpenSSL::X509::Certificate#crl_uris makes the assumption that each DistributionPoint in the CRL distribution points extension contains a single general name of type URI. This is not guaranteed by RFC 5280. A DistributionPoint may only contains something other than a URI, or more than one URI.
Let's include all URIs seen in the extension. If only non-URI pointers are found, return an empty array.
Fixes: #775