spec: move cgo stuff to their own file

so it can build without cgo since seccomp requires it.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

pkg/spec/config_linux_nocgo.go

@@ -0,0 +1,11 @@
+// +build linux,!cgo
+
+package createconfig
+
+import (
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+func getSeccompConfig(config *CreateConfig, configSpec *spec.Spec) (*spec.LinuxSeccomp, error) {
+	return nil, nil
+}