Since macOS 12.0, the hdiutil udifrez and hdiutil udifderez
commands to embed and extract resources in a disk image are deprecated.
The CPack DragNDrop Generator uses these to attach the SLA specified by
the CPACK_RESOURCE_FILE_LICENSE option. Since that option is shared
by multiple CPack generators, we cannot deprecate it. Instead, add an
explicit option to control the behavior. This will give projects a way
to package on future macOS versions that remove the commands.
In order to provide a long-term transition away from attaching SLAs to
disk images, update cpack to default this behavior to OFF. To retain
compatibility for CMake projects, teach the CPack module to default the
option to ON. Later a policy can be added to change the default.
Issue: #22978 (closed)