CURLOPT_UPLOAD(3) on macOS

The text 7c256fcd1f56, 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.

enable data upload

CURLOPT_UPLOAD(3) on macOS now