CURLOPT_IGNORE_CONTENT_LENGTH(3) on macOS

The text 6798c48f10c4, 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.

ignore content length

CURLOPT_IGNORE_CONTENT_LENGTH(3) on macOS now