When running on an aarch64 host, we need to download a different version of the Swift compiler in order to do the build. If we run the build on a macOS host, we also have to tell the update-checkout script to fetch all the required dependencies (even Linux-only ones).
Also tell Foundation where swift-collections lives, to avoid it fetching another copy.
When running on an aarch64 host, we need to download a different version of the Swift compiler in order to do the build. If we run the build on a macOS host, we also have to tell the update-checkout script to fetch all the required dependencies (even Linux-only ones).
Also tell Foundation where swift-collections lives, to avoid it fetching another copy.