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obu: don't abort on unknown OBUs

The spec states that a decoder should instead ignore them. Otherwise, streams
compliant with an hypothetical future revision of the spec may be rejected when
backwards compatibility is expected.

--- a/src/obu.c

+++ b/src/obu.c

@@ -1427,8 +1427,9 @@

         // ignore OBUs we don't care about

         break;

     default:

+        // print a warning but don't fail for unknown types

         dav1d_log(c, "Unknown OBU type %d of size %u\n", type, len);

-        return DAV1D_ERR(EINVAL);

+        break;

     }

     if (c->seq_hdr && c->frame_hdr) {