Fix Xcode SDK Version too old to Build / Archive for iOS & macOS

When having an older Mac or Macbook, it can be that Xcode becomes too old.

You will get a message like:

SDK Version issue. This app was build with tvOS 16.1 SDK. All tvOS apps must be build with the tvOS 17 SDK or later, included in Xcode 15 or later ...

There are three options to still build:

1. Upgrade your macOS version. If not possible you might have to buy a new Apple Device.
2. Use XCode Cloud. That can still build with newser versions.
3. Use OpenCore Legacy. It can install newer versions of macOS on your unsupported Mac. That can come with security problems of course.