curl_share_setopt(3) on macOS

The text 72c57cc60a42, 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 options for a shared object

curl_share_setopt(3) on macOS now