CURLOPT_RESUME_FROM(3) on macOS

The text 93238081fd2e, 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 a point to resume transfer from

CURLOPT_RESUME_FROM(3) on macOS now