make eltorito_load static

src/arch/i386/image/eltorito.c

  * @v image		El Torito file
  * @ret rc		Return status code
  */
-int eltorito_load ( struct image *image ) {
+static int eltorito_load ( struct image *image ) {
 	struct eltorito_boot_entry boot_entry;
 	unsigned long bootcat_offset;
 	int rc;