Fix dependencies

vendor/google.golang.org/protobuf/internal/impl/codec_unsafe.go

@@ -1,17 +0,0 @@
-// Copyright 2019 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.
-
-// +build !purego,!appengine
-
-package impl
-
-// When using unsafe pointers, we can just treat enum values as int32s.
-
-var (
-	coderEnumNoZero      = coderInt32NoZero
-	coderEnum            = coderInt32
-	coderEnumPtr         = coderInt32Ptr
-	coderEnumSlice       = coderInt32Slice
-	coderEnumPackedSlice = coderInt32PackedSlice
-)