container: make path resolution fns Windows-only

The new daemon.containerFSView type covers all the use-cases on Linux
with a much more intuitive API, but is not portable to Windows.
Discourage people from using the old and busted functions in new Linux
code by excluding them entirely from Linux builds.

Signed-off-by: Cory Snider <csnider@mirantis.com>

container/archive.go → container/archive_windows.go

@@ -18,7 +18,7 @@ func (container *Container) ResolvePath(path string) (resolvedPath, absPath stri
 	if container.BaseFS == "" {
 		return "", "", errors.New("ResolvePath: BaseFS of container " + container.ID + " is unexpectedly empty")
 	}
-	// Check if a drive letter supplied, it must be the system drive. No-op except on Windows
+	// Check if a drive letter supplied, it must be the system drive.
 	path, err = system.CheckSystemDriveAndRemoveDriveLetter(path)
 	if err != nil {
 		return "", "", err