Add iso9660 library and regression test.

Will be deleted from vcdimager-cdio branch.
cd_types.c: forgot to add previously.

include/cdio/types.h

@@ -1,5 +1,5 @@
 /*
-    $Id: types.h,v 1.3 2003/06/07 10:44:14 rocky Exp $
+    $Id: types.h,v 1.4 2003/08/17 05:31:19 rocky Exp $
 
     Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
     Copyright (C) 2002,2003 Rocky Bernstein <rocky@panix.com>
@@ -217,6 +217,13 @@ extern "C" {
     Constant for invalid LSN
   */
 #define CDIO_INVALID_LSN   0xFFFFFFFF
+
+  /* Opaque types ... */
+
+  /* Defined fully in iso9660_private.h */
+  typedef struct iso_primary_descriptor pvd_t;
+
+
   
 #ifdef __cplusplus
 }