/*
 * call-seq:
 *   Curl.spnego?                                     => true or false
 *
 * Returns true if the installed libcurl was built with support for SPNEGO
 * authentication (Simple and Protected GSS-API Negotiation Mechanism, defined
 * in RFC 2478). For libcurl versions < 7.10.8, always returns false.
 */
static VALUE ruby_curl_spnego_q(VALUE mod) {