Fix fuzz warnings.

Version 0.32.2 of `rust-bitcoin` deprecates a number of methods that
are commonly used in this project, most visibly `txid()`, which is
now called `compute_txid()`. This resulted in a lot of warnings, and
this commit is part of a series that seeks to address that.

Author: arik-so

fuzz/src/chanmon_consistency.rs

@@ -880,7 +880,7 @@ pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out, anchors: bool) {
 							script_pubkey: output_script,
 						}],
 					};
-					funding_output = OutPoint { txid: tx.txid(), index: 0 };
+					funding_output = OutPoint { txid: tx.compute_txid(), index: 0 };
 					$source
 						.funding_transaction_generated(
 							temporary_channel_id,

fuzz/src/full_stack.rs

@@ -306,7 +306,7 @@ impl<'a> MoneyLossDetector<'a> {
 	fn connect_block(&mut self, all_txn: &[Transaction]) {
 		let mut txdata = Vec::with_capacity(all_txn.len());
 		for (idx, tx) in all_txn.iter().enumerate() {
-			let txid = tx.txid();
+			let txid = tx.compute_txid();
 			self.txids_confirmed.entry(txid).or_insert_with(|| {
 				txdata.push((idx + 1, tx));
 				self.height
@@ -898,7 +898,7 @@ pub fn do_test(mut data: &[u8], logger: &Arc<dyn Logger>) {
 					if tx.version.0 > 0xff {
 						break;
 					}
-					let funding_txid = tx.txid();
+					let funding_txid = tx.compute_txid();
 					if loss_detector.txids_confirmed.get(&funding_txid).is_none() {
 						let outpoint = OutPoint { txid: funding_txid, index: 0 };
 						for chan in channelmanager.list_channels() {
@@ -923,7 +923,7 @@ pub fn do_test(mut data: &[u8], logger: &Arc<dyn Logger>) {
 							panic!();
 						}
 					}
-					let funding_txid = tx.txid();
+					let funding_txid = tx.compute_txid();
 					for idx in 0..tx.output.len() {
 						let outpoint = OutPoint { txid: funding_txid, index: idx as u16 };
 						pending_funding_signatures.insert(outpoint, tx.clone());