Add dr_1b.h to dr.h

Signed-off-by: Jean-Paul Saman <jpsaman@videolan.org>

src/descriptors/dr.h

@@ -50,6 +50,7 @@
 #include "dr_12.h"
 #include "dr_13.h"
 #include "dr_14.h"
+#include "dr_1b.h"
 #include "dr_40.h"
 #include "dr_41.h"
 #include "dr_42.h"