Add more first-class support for SCSVS
Just as we have a table of ssl3_ciphers, add a table of ssl3_scsvs, to contain SSL_CIPHER objects for these non-valid ciphers. This will allow for unified handling of such indicators, especially as we are preparing to pass them around between functions. Since the 'valid' field is not set for the SCSVs, they should not be used for anything requiring a cryptographic cipher (as opposed to something being stuck in a cipher-shaped hole in the TLS wire protocol). Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2279)
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