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grub-mkconfig will generate a root=ZFS=pool/path line. Fix nlplug-findfs
to deal with search device ZFS=... and fix initramfs to also deal with a
missing rootfstype=zfs

A side-effect of this is that it is faster to boot zfs root since we no
longer need to wait for nlplug-findfs timeout of 5 seconds.

fixes #9889

If /boot is on the root partition, I.E., no separate /boot partition,
then the /boot/boot symlink incorrectly pointed to /.  Pointing
/boot/boot to "." is correct in all situations.

backport from project mkinitfs

busybox 1.28.2 had a regression in cpio symlinks. make sure we have a
fixed busybox version.

fixes #8751

This has been fixed in busybox 1.28.2.

See: https://git.busybox.net/busybox/commit/?h=1_28_stable&id=37277a23fe48b13313f5d96084d890ed21d5fd8b

Intentionally disabled in 49b7ed8a but
accidentally not reenable in b19daa91.

we need to temporarily use cryptsetup1 since mkinintfs is already
installed on the builders and depends on cryptsetup-libs (previous
version). We do this so we can install cryptsetup-dev 2.0.0 which
conflicts whith the runtime dep of mkinitfs.

Skip pre/post apk hooks on diskless initramfs installation.

This commit updates $license variable in all APKBUILDs to comply with
short names specified by SPDX version 3.0 [1] where possible. It was
done using find-and-replace method on substrings inside $license
variables.

Only license names were updated, not "expressions" specifying relation
between the licenses (e.g. "X and Y", "X or Y", "X and (Y or Z)") or
exceptions (e.g. "X with exceptions").

Many licenses have a version or multiple variants, e.g. MPL-2.0,
BSD-2-Clause, BSD-3-Clause. However, $license in many aports do not
contain license version or variant. Since there's no way how to infer
this information just from abuild, it were left without the variant
suffix or version, i.e. non SPDX compliant.

GNU licenses (AGPL, GFDL, GPL, LGPL) are especially complicated. They
exist in two variants: -only (formerly e.g. GPL-2.0) and -or-later
(formerly e.g. GPL-2.0+). We did not systematically noted distinguish
between these variants, so GPL-2.0, GPL2, GPLv2 etc. may mean
GPL-2.0-only or GPL-2.0-or-later. Thus GNU licenses without "+" (e.g.
GPL2+) were left without the variant suffix, i.e. non SPDX compliant.

Note: This commit just fixes format of the license names, no
verification has been done if the specified license information is
actually correct!

[1]: https://spdx.org/licenses/

Most of these updates is based on data from https://repology.org/,
detection based on permanent redirect from http:// to https://.

$source urls are updated when they contain $url as substring.

When bootstrapping aarch64, mkinitfs fails to build with the following
error

```
+ apkbuildname mkinitfs
+ local repo=mkinitfs
+ local pkg=mkinitfs
+ [ mkinitfs = mkinitfs ]
+ repo=main
+ echo /home/builder/aports-edge/main/mkinitfs/APKBUILD
+ CHOST=aarch64 BOOTSTRAP=bootimage APKBUILD=/home/builder/aports-edge/main/mkinitfs/APKBUILD abuild -r
>>> mkinitfs: abuild 3.0.2-r0
>>> mkinitfs: Checking sanity of /home/builder/aports-edge/main/mkinitfs/APKBUILD...
>>> mkinitfs: Analyzing dependencies...
ERROR: unsatisfiable constraints:
  /bin/sh (virtual):
    provided by: busybox
    required by: kmod-24-r0[/bin/sh]
                 kmod-24-r0[/bin/sh]
  .makedepends-mkinitfs-0:
    masked in: cache
    satisfies: world[.makedepends-mkinitfs]
>>> ERROR: mkinitfs: all failed
>>> mkinitfs: Uninstalling dependencies...
```

Adding busybox to makedepends_host fixes this issue.
Signed-off-by: Rajiv Ranganath <rajiv.ranganath@atihita.com>