OpenSSL: Fix server side openssl_ecdh_curves configuration with 1.0.2

It looks like SSL_CTX_set1_curves_list() command alone is not sufficient
to enable ECDH curve selection with older OpenSSL versions for TLS
server, so enable automatic selection first and specify the exact list
of curves after that.

This fixes failures in openssl_ecdh_curves test case when hostapd uses
OpenSSL 1.0.2.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/crypto/tls_openssl.c

@@ -5037,6 +5037,9 @@ int tls_global_set_params(void *tls_ctx,
 		return -1;
 #else /* OPENSSL_IS_BORINGSSL || < 1.0.2 */
 #ifndef OPENSSL_NO_EC
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+		SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
+#endif
 		if (SSL_CTX_set1_curves_list(ssl_ctx,
 					     params->openssl_ecdh_curves) !=
 		    1) {