bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS

[Paul Eggert]

Attached is an updated proposal for the fclonefileat patch.

CVE-2021-30995 confirmed my suspicion that coreutils 9.1 and the current 
bleeding-edge coreutils on Savannah both have an exploitable security 
bug on macOS. Although I hope this patch fixes the bug, it could use 
more pairs of eyes, given that Apple had so many problems fixing its own 
security bug involving fclonefileat, and given that the coreutils code 
has so many flags and conditions.

0001-cp-fclonefileat-security-fix-CLONE_ACL-fixups.patch
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