CPack/DragNDrop: SLA 'hdiutil udifrez' deprecated in macOS 12.0
Since !4972 (merged), we use
hdiutil udifrez to attach the SLA as a resource to the
.dmg, replacing older methods that were previously deprecated, i.e. #20889 (closed).
Now macOS 12.0's
man hdiutil says that the "hdiutil udifrez/udifderez (embed and extract resources)" operations are deprecated too.
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