CURLOPT_FNMATCH_DATA − custom pointer to fnmatch callback
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FNMATCH_DATA,
Pass a pointer that will be untouched by libcurl and passed as the ptr argument to the CURL_FNMATCH_FUNCTION(3).
Added in 7.21.0
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.