Windows: Docker build starting to work

Signed-off-by: John Howard <jhoward@microsoft.com>

chrootarchive/init_unix.go

@@ -0,0 +1,28 @@
+// +build !windows
+
+package chrootarchive
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+
+	"github.com/docker/docker/pkg/reexec"
+)
+
+func init() {
+	reexec.Register("docker-applyLayer", applyLayer)
+	reexec.Register("docker-untar", untar)
+}
+
+func fatal(err error) {
+	fmt.Fprint(os.Stderr, err)
+	os.Exit(1)
+}
+
+// flush consumes all the bytes from the reader discarding
+// any errors
+func flush(r io.Reader) {
+	io.Copy(ioutil.Discard, r)
+}