[Toybox] /sys/block going away?

[enh]

i didn't really understand
https://www.phoronix.com/news/Linux-6.4-Drop-Old-Sysfs-Layout or
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?h=driver-core-next&id=721da5cee9d43901105f5b8bd33fcb9101b12fc3,
but i do see that toybox has a couple of references to /sys/block...

the one in external/toybox/toys/other/nbd_client.c seems like it could
trivially change to /sys/class/block,
but external/toybox/toys/pending/mdev.c says
```
  // Entries in /sys/class/block aren't char devices, so skip 'em.  (We'll
  // get block devices out of /sys/block.)
  if(!strcmp(node->name, "block")) return 0;
```
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