update-channel-accept: accept the channel update.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

commit_tx.h

@@ -4,12 +4,14 @@
 #include "lightning.pb-c.h"
 
 struct sha256_double;
+struct sha256;
 
 /* Create commitment tx to spend the anchor tx output; doesn't fill in
  * input scriptsig. */
 struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
 				    OpenChannel *ours,
 				    OpenChannel *theirs,
+				    const struct sha256 *revocation_hash,
 				    int64_t delta,
 				    const struct sha256_double *anchor_txid,
 				    unsigned int anchor_output);