curl_easy_reset(3) on macOS

The text 4bc6f39c5bc1, as Mac OS X 10.7.5, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.

reset all options of a libcurl session handle

curl_easy_reset(3) on macOS now