Fix dependencies

vendor/google.golang.org/protobuf/runtime/protoiface/legacy.go

@@ -1,15 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package protoiface
-
-type MessageV1 interface {
-	Reset()
-	String() string
-	ProtoMessage()
-}
-
-type ExtensionRangeV1 struct {
-	Start, End int32 // both inclusive
-}