[issue21015] support SSL_CTX_set_ecdh_auto on newer OpenSSLs

[Antoine Pitrou]

Antoine Pitrou added the comment:

> I know it doesn't segfault or raise an error if you do that, but I don't know if it:
> 
> 1) Replaces the already called ECDH Curve
> 2) Adds to the already called ECDH Curve
> 3) Silently Does Nothing.

Judging by OpenSSL's code, it replaces the already called ECDH curve.

(from s3_lib.c:

		if (s->cert->ecdh_tmp != NULL)
			EC_KEY_free(s->cert->ecdh_tmp);
		s->cert->ecdh_tmp = ecdh;

)

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