i-t: rewrite hooks

This produces a leaner image, doesn't fail if zdb doesn't exist,
properly handles hostnameless systems, doesn't mention crypto modules
for no reason, doesn't add useless empty executable in hopes an
eight-year-old PR is merged, uses i-t builtins for all copies

Also optimize the checkbashisms filter to spawn one (or a few) awks
instead of one per regular file and remove initramfs/hooks therefrom due
to a command -v false positive

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Ahelenia Ziemiańska <[email protected]>
Closes #12017

0 files changed, 0 insertions, 0 deletions