I just tested Connector/C master branch with 10.4 (both connector and server using openssl 1.1.0c).

openssl_6975 fails with following error:

-Ssl_cipher	DHE-RSA-AES256-SHA

+Ssl_cipher	ECDHE-RSA-AES256-SHA

 SSLv3 ciphers: user requires SSLv3 cipher AES128-SHA

The test fails, since there was no explicit cipher suite specified, but a group of cipher suites, e.g. --ssl-cipher=tlsv1.2

There is no guarantee, that client and server always agree to use a certain cipher suite. Preferred cipher suites changed several times in different openssl versions (e.g.1.1.0 prefers elliptic curves cipher suites) and often client and server might have different configurations and therefore different preferred cipher suites.