CURLOPT_SSLVERSION(3) on macOS

The text 614f2f7f5e7e, as macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

set preferred TLS/SSL version

CURLOPT_SSLVERSION(3) on macOS now