add confonly to strategy least ping

app/router/strategy_leastping.go

@@ -1,7 +1,10 @@
+// +build !confonly
+
 package router
 
 import (
 	"context"
+
 	core "github.com/v2fly/v2ray-core/v4"
 	"github.com/v2fly/v2ray-core/v4/common"