/*
 * call-seq:
 *   easy.pre_transfer_time                           => float
 *
 * Retrieve the time, in seconds, it took from the start until the
 * file transfer is just about to begin. This includes all pre-transfer
 * commands and negotiations that are specific to the particular protocol(s)
 * involved.
 */
static VALUE ruby_curl_easy_pre_transfer_time_get(VALUE self) {