The filesystem layout of darwin SDK elements.
sdkmacOS SDK layout: TOP { /usr/include, /usr/lib, /System/Library/Frameworks }.
vendoredShipped libc layout: TOP { /lib/libc/include, /lib/libc/darwin, <NONE> }.
pub const DarwinSdkLayout = enum {
/// macOS SDK layout: TOP { /usr/include, /usr/lib, /System/Library/Frameworks }.
sdk,
/// Shipped libc layout: TOP { /lib/libc/include, /lib/libc/darwin, <NONE> }.
vendored,
}