We add a symlink `mount.fuse.apfs-fuse ~~> apfs-fuse`, so that we can specify
`fuse.apfs-fuse` as `fsType` in `nixos` and have the device mounted. The
current alternative is to specify: `fuse./run/current-system/sw/bin/apfs-fuse`
as `fsType`.
On other distros, using `fuse.apfs-fuse` should work since `mount.fuse`
will just runs `apfs-fuse`, but on nixos the `PATH` of `mount.fuse` is
restricted. The symlink makes it work directly, without having
`mount.fuse` doing the dispatch.
