Windows: Archive package changes for Windows daemon

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

archive/changes_windows.go

@@ -0,0 +1,20 @@
+package archive
+
+import (
+	"github.com/docker/docker/pkg/system"
+)
+
+func statDifferent(oldStat *system.Stat_t, newStat *system.Stat_t) bool {
+
+	// Don't look at size for dirs, its not a good measure of change
+	if oldStat.ModTime() != newStat.ModTime() ||
+		oldStat.Mode() != newStat.Mode() ||
+		oldStat.Size() != newStat.Size() && !oldStat.IsDir() {
+		return true
+	}
+	return false
+}
+
+func (info *FileInfo) isDir() bool {
+	return info.parent == nil || info.stat.IsDir()
+}