update vendor

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/containerd/continuity/driver/driver_windows.go

@@ -0,0 +1,21 @@
+package driver
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+func (d *driver) Mknod(path string, mode os.FileMode, major, minor int) error {
+	return errors.Wrap(ErrNotSupported, "cannot create device node on Windows")
+}
+
+func (d *driver) Mkfifo(path string, mode os.FileMode) error {
+	return errors.Wrap(ErrNotSupported, "cannot create fifo on Windows")
+}
+
+// Lchmod changes the mode of an file not following symlinks.
+func (d *driver) Lchmod(path string, mode os.FileMode) (err error) {
+	// TODO: Use Window's equivalent
+	return os.Chmod(path, mode)
+}