cdxl: disable checked bitstream reader

Overreads should not be possible.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/cdxl.c

@@ -19,6 +19,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#define UNCHECKED_BITSTREAM_READER 1
+
 #include "libavutil/intreadwrite.h"
 #include "libavutil/imgutils.h"
 #include "avcodec.h"