/*
 * Get the visibility of the equalizer window.
 *
 * Examples:
 *   puts 'equalizer window visible' if remote.equalizer_visible?
 *   puts 'equalizer window visible' if remote.eq_visible?
 *   puts 'equalizer window visible' if remote.equalizer?
 *   puts 'equalizer window visible' if remote.eq?
 *
 */
static VALUE xr_is_eq(VALUE self) {