prune remotecommand dependency

prune a dependency that was only being used for a simple struct.  Should
correct checksum issue on tarballs

[NO TESTS NEEDED]

Fixes: #9355

Signed-off-by: baude <bbaude@redhat.com>

vendor/google.golang.org/appengine/internal/identity_flex.go

@@ -1,11 +0,0 @@
-// Copyright 2018 Google LLC. All rights reserved.
-// Use of this source code is governed by the Apache 2.0
-// license that can be found in the LICENSE file.
-
-// +build appenginevm
-
-package internal
-
-func init() {
-	appengineFlex = true
-}