migrate to github.com/moby/go-archive module

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/moby/go-archive/path_windows.go

@@ -0,0 +1,22 @@
+package archive
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+// checkSystemDriveAndRemoveDriveLetter is the Windows implementation
+// of CheckSystemDriveAndRemoveDriveLetter
+func checkSystemDriveAndRemoveDriveLetter(path string) (string, error) {
+	if len(path) == 2 && string(path[1]) == ":" {
+		return "", fmt.Errorf("no relative path specified in %q", path)
+	}
+	if !filepath.IsAbs(path) || len(path) < 2 {
+		return filepath.FromSlash(path), nil
+	}
+	if string(path[1]) == ":" && !strings.EqualFold(string(path[0]), "c") {
+		return "", fmt.Errorf("the specified path is not on the system drive (C:)")
+	}
+	return filepath.FromSlash(path[2:]), nil
+}