multi: add custom feature bits to config options

lncfg/protocol_experimental_off.go

@@ -3,6 +3,11 @@
 
 package lncfg
 
+import (
+	"github.com/lightningnetwork/lnd/feature"
+	"github.com/lightningnetwork/lnd/lnwire"
+)
+
 // ExperimentalProtocol is a sub-config that houses any experimental protocol
 // features that also require a build-tag to activate.
 type ExperimentalProtocol struct {
@@ -13,3 +18,8 @@ type ExperimentalProtocol struct {
 func (p ExperimentalProtocol) CustomMessageOverrides() []uint16 {
 	return nil
 }
+
+// CustomFeatures returns a custom set of feature bits to advertise.
+func (p ExperimentalProtocol) CustomFeatures() map[feature.Set][]lnwire.FeatureBit {
+	return map[feature.Set][]lnwire.FeatureBit{}
+}