Migrate Sirupsen to sirupsen.

vendor/github.com/containerd/continuity/hardlinks_windows.go

@@ -0,0 +1,12 @@
+package continuity
+
+import "os"
+
+type hardlinkKey struct{}
+
+func newHardlinkKey(fi os.FileInfo) (hardlinkKey, error) {
+	// NOTE(stevvooe): Obviously, this is not yet implemented. However, the
+	// makings of an implementation are available in src/os/types_windows.go. More
+	// investigation needs to be done to figure out exactly how to do this.
+	return hardlinkKey{}, errNotAHardLink
+}