use/grub/localboot, use/grub/sdab similar to use/syslinux/localboot,
use/syslinux/sdab.

Since there is now an HDT (Hardware Detection Tool) for grub-pc,
there is not reason use syslinux.

Note: syslinux --install needed /proc, so:
@$(call set,GLOBAL_HSH_PROC,1)

See-also: mkimage/doc/README.ru

memtest is not part of syslinux.
Also replace tabs to spacebar.

This change sets the default root password to 'altlinux'
for all the images that employ use/oem feature.
This password will be reset by the configuration wizard at
the first boot and cannot be used to login
to ssh even if it's enabled out-of-the-box. So, 'happy
path' user experience of our distros does not change;
but it helps in troubleshooting the cases
when alterator-setup cannot start e.g. due to broken
graphics.

See https://lists.altlinux.org/pipermail/devel-distro/2021-April/002351.html

Raising the priority of a targeted package does not help, and
lowering the priority of a non-targeted package helped.

Because of this, distclean did not work. Only the symlink was
removed.

Previously, when rebuilding, the new reports were copied as a
subdirectory.

method=disk has a number of unsolved problems in the installer.

Input doesn't work without udev-rule-generator-net.

Removed from Sisyphus:
http://git.altlinux.org/tasks/archive/done/_263/269335
http://git.altlinux.org/tasks/archive/done/_263/269353

Already in the mainline linux kernel >= 5.10.

This will allow in the future to use a different initrd option when
building images, for example dracut.
Also drop old make-inird support.

the * symbol was seen as a symbol because of the options in the shebang.

In the future, it is planned building iso without propagator.

the variable was renamed earlier. See: sub.in/stage1/Makefile.