Add a BIO_lookup_ex() function
The existing BIO_lookup() wraps a call to getaddrinfo and provides an abstracted capability to lookup addresses based on socket type and family. However it provides no ability to lookup based on protocol. Normally, when dealing with TCP/UDP this is not required. However getaddrinfo (at least on linux) never returns SCTP addresses unless you specifically ask for them in the protocol field. Therefore BIO_lookup_ex() is added which provides the protocol field. Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3286)
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