/*
 * call-seq:
 *   easy.redirect_time                               => float
 *
 * Retrieve the total time, in seconds, it took for all redirection steps
 * include name lookup, connect, pretransfer and transfer before final
 * transaction was started. +redirect_time+ contains the complete
 * execution time for multiple redirections.
 *
 * Requires libcurl 7.9.7 or higher, otherwise -1 is always returned.
 */
static VALUE ruby_curl_easy_redirect_time_get(VALUE self) {