/*
 * call-seq:
 *   easy.start_transfer_time                         => float
 *
 * Retrieve the time, in seconds, it took from the start until the first byte
 * is just about to be transferred. This includes the +pre_transfer_time+ and
 * also the time the server needs to calculate the result.
 */
static VALUE ruby_curl_easy_start_transfer_time_get(VALUE self) {