Revert "update to use containerd seccomp package"

This reverts commit 4f8e065faf055d3f0463a92622297ca3afac07f4.

vendor/github.com/opencontainers/image-spec/.tool/check-license

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+ret=0
+
+for file in $(find . -type f -iname '*.go' ! -path './vendor/*'); do
+	if ! head -n3 "${file}" | grep -Eq "(Copyright|generated|GENERATED)"; then
+		echo "${file}:missing license header"
+		ret=1
+	fi
+done
+
+exit $ret