chainntnfs: guard test chain notifier under debug flag

chainntnfs/bitcoindnotify/bitcoind_debug.go

@@ -1,3 +1,5 @@
+// +build debug
+
 package bitcoindnotify
 
 import (

chainntnfs/btcdnotify/btcd_debug.go

@@ -1,3 +1,5 @@
+// +build debug
+
 package btcdnotify
 
 import (

chainntnfs/interface_debug.go

@@ -1,3 +1,5 @@
+// +build debug
+
 package chainntnfs
 
 import "github.com/btcsuite/btcd/chaincfg/chainhash"

chainntnfs/neutrinonotify/neutrino_debug.go

@@ -1,3 +1,5 @@
+// +build debug
+
 package neutrinonotify
 
 import (