xattr_name_with_flags(3) on macOS

The text 32fedbf51525, as macOS 10.15.6, macOS 10.15.5, macOS 10.15.4, macOS 10.15.3, macOS 10.15.2, macOS 10.15.1, macOS 10.15 shipped it.

xattr_name_with_flags(3) on macOS now