Revert "update to use containerd seccomp package"

This reverts commit 4f8e065faf055d3f0463a92622297ca3afac07f4.

vendor/github.com/opencontainers/image-spec/schema/gen.go

@@ -0,0 +1,21 @@
+// Copyright 2016 The Linux Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package schema
+
+// Generates an embbedded http.FileSystem for all schema files
+// using esc (https://github.com/mjibson/esc).
+
+// This should generally be invoked with `make schema-fs`
+//go:generate esc -private -pkg=schema -include=.*\.json$ .