curl_version(3) on macOS

The text 5b2250445d53, as Mac OS X 10.8.5, Mac OS X 10.8.4, Mac OS X 10.8.3, Mac OS X 10.8.2, Mac OS X 10.8.1, Mac OS X 10.8 shipped it.

returns the libcurl version string

curl_version(3) on macOS now