Corresponds to https://github.com/openzfs/zfs/pull/12350/files
The goal of these two edits is to define it for the kernel portion as well as userland although I don't know if I did it in the best spot in either case (see https://github.com/openzfs/zfs/pull/4059 for context). It would be safe to enable on all userland.
MFC: 1 month