[issue21015] support SSL_CTX_set_ecdh_auto on newer OpenSSLs

[Antoine Pitrou]

Antoine Pitrou added the comment:

So, I think I've found the issue. On OpenSSL < 1.0.0, the ECDH ciphers exist but the "ECDH" cipher alias doesn't. I've committed a patch which should fix the issue, although the set_ciphers() call may be entirely useless given our current default cipher list.

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<http://bugs.python.org/issue21015>
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