Implement DSA_SIG_set0() and ECDSA_SIG_set0(), for setting signature values.
SSH2 implementations which use DSA_do_verify() and ECDSA_do_verify() are given the R and S values, and the data to be signed, by the client. Thus in order to validate these signatures, SSH2 implementations will digest and sign the data -- and then pass in properly provisioned DSA_SIG and ECDSA_SIG objects. Unfortunately, the existing OpenSSL-1.1.0 APIs do not allow for directly setting those R and S values in these objects, which makes using OpenSSL for such SSH2 implementations much more difficult. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Emilia Käsper <emilia@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1193)
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