/*
 * call-seq:
 *   Curl.sspi?                                       => true or false
 *
 * Returns true if the installed libcurl was built with support for SSPI.
 * This is only available on Windows and makes libcurl use Windows-provided
 * functions for NTLM authentication. It also allows libcurl to use the current
 * user and the current user's password without the app having to pass them on.
 * For libcurl versions < 7.13.2, always returns false.
 */
static VALUE ruby_curl_sspi_q(VALUE mod) {