This reverts commit 147964b0.
installer-feature-create-ghost-directories not needed more.
See-also: https://bugzilla.altlinux.org/show_bug.cgi?id=37171

Not all systemd-based images need these settings,
so don't change +systemd alias.

See-also: https://lists.altlinux.org/pipermail/devel-distro/2019-July/001710.html

The builder-useradd package installs components of ALT build
environment into the system, namely gear, hasher, and git-core
required for those to work.

See commit 207cec89c4515fefa2b711acd06c645ed3bd0ee8.

KFLAVOURS can describe more than one kernel, get iterator back.

Fixes: 27674e29

- ppc64le support (glebfm@)
- build-vm hacked to build tarballs too (iv@ et al)
- p8.mk: dropped; along with other cleanups/fixups (antohami)

It was misleading already, and riscv64 is going to join the gang
(but not there yet) following aarch64, mipsel, ppc64le and more
e2k* subarches...

I've just borrowed glebfm@'s one introduced by commit
ec23a8ec before; this
still might be improved it seems.
Suggested-by: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org>

When grub-install(1) works on non-virtualized PowerPC system it may
execute scripts from powerpc-utils package.

ieee1275boot bootloader support was added in mkimage 0.2.27.

Plymouth is (much more) portable, but our branding packages contain
bootsplash designs only on x86 nowdays.

...to create users root:alt and alt:root as per BaseALT's rebranding.

This allows one not to hope that only the packages of the desired
loader will be installed.