The commit 99695713 used this variable
even though it didn't exist yet. A good reason to add this variable.

- efi: add mokutil, pesign to COMMON_PACKAGES (for Secure Boot,
  requset by nikel@)
- build.mk: fix build without APTCONF parameter
- image.in/Makefile: fix save-profile (exclude .work)
- bin/metadep-expander: fix output redirection to /dev/null
- bin/metadep-expander: do not abort build, if metapackage not available
- adapt bin/check-pkg-list for mkimage-profiles. Use for build without
  parameter CHECK=0
- reports.mk: fix build with REPORT=1, CHECK=1 and undefined DEBUG
- test.mk: add package availability test in all package lists.
  Usage: make CHECK=1 DEBUG=1 check-all-pkglists.iso
- add missing README for features: mipsel-bfk3, mipsel-mitx, lxc
- ve.mk, vm.mk: replace systemd to use/init/systemd (request by obirvalger@)
- net: Add networkd/resolved and networkd/resolved-stub subfeatures
  (thanks obirvalger@)
- education, slinux, workstation: fix build for non e2k ARCH.
  See also commit 'e2k: add a stub for non e2k%'
- education, slinux, workstation: add use/arm-rpi4 to vm/ targets
  on aarch64, armh
- fix build vm/alt-workstation-cloud
- fix build vm/regular-cnc-rt-efi
- drop armh.conf, target use/slinux/arm and linux-arm list
- cleanup unavailable packages for p10 from package lists

This target and list was only needed for armh.mk. They are no longer needed.

This is not a supported legacy since p8.

kdeedu-kturtle, umki not available for p9 and newer branchs.

repetierhost not available for any branch.
skeinforge not available for p10 and newer branchs.

emacs-w3m not available for p8 and newer branchs.

fvwm-crystal not available for p9 and newer branchs.

not available for p8 and newer branchs.

dissy not available for p10 and newer branchs.

firmware-rt73 not available for p8 and newer branchs.

xmonad not available for p10 and newer branchs.

sugar not available for p9 and newer branchs.

udev-alsa not available for p10 and newer branchs.

chestnut-dialer-gtk2 not available for p10 and newer branchs.

gksu not available for p10 and newer branchs.

Removed from Sisyphus:
http://git.altlinux.org/tasks/archive/done/_276/283032

This dependency is not relevant for p8 and newer branchs.
This is also a problem for check-pkg-list.

use/e2k/multiseat/full invoked from many targets, regardless of the
fact that it is e2k.

Aptbox is not initialized, so build time is reduced.

Readme, Makefile are copied when:
@$(call add, THE_LISTS, *)

Usage:
make CHECK=1 DEBUG=1 check-all-pkglists.iso

Checking lists for unavailable packages.