deltas: Stub out a few more opcodes

src/libostree/ostree-repo-static-delta-private.h

@@ -135,6 +135,7 @@ typedef enum {
   OSTREE_STATIC_DELTA_OP_OPEN_SPLICE_AND_CLOSE = 'S',
   OSTREE_STATIC_DELTA_OP_OPEN = 'o',
   OSTREE_STATIC_DELTA_OP_WRITE = 'w',
+  OSTREE_STATIC_DELTA_OP_SET_READ_SOURCE = 'R',
   OSTREE_STATIC_DELTA_OP_CLOSE = 'c'
 } OstreeStaticDeltaOpCode;