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the wget -s option was removed in busybox 1.26
https://git.busybox.net/busybox/commit/?id=2972e2c4acb9c46a8cc05c857acac2b3d439bf69

ref #6683

fixes #2876

fixes #6517

The output format of util-linux losetup is different, and there's
no easy way to get uniform output from these two implementations.

The fakeroot fake-env feature requires that the filesystem if unmodified between the
reloads of the fake-env. We dont comply with this so we re-exec the
entire script in fakeroot instead.

mksquashfs will ignore errors and continue by default by design. This is
definitively not the behavior we want so we tell it to explicitly exit
on error.

it is likely needed if it is set.

ref #6219

This is a way to inject the users pubkey to initramfs

To create boot media, otherwise it is assumed to be updating
live system and /boot is mounted.

to simplify creation of bootable images from external repositries
and with developer signing keys.

- install dtbs to right place from kernel source trees
- install rpi dtbs to root of boot media (fixes #5884)
- support aarch64

fixes #5883

Fixes the Linux raspberry pi dtoverlays not being copied into the
update-kernel destination directory.

ref #5719

in case we need skip more than 2G.

fix warnings about unsigned/signed chars and return from non-void
function.