syslinux is temporarily broken.
See-also: https://bugzilla.altlinux.org/show_bug.cgi?id=39805

More than one BOOTLOADER may be available for the same architecture.
Set IMAGE_PACKTYPE in boot/iso, there is no point in duplicating
in different features.
Closes ALT bug 39786.

There is no point in duplicating conditions.

- Set BOOT_TYPE, BOOTLOADER to efiboot for aarch64 (needed mkimage 1.38)
- 'Simply Linux 9.1 (beta)' commits contained (Thanks sem@)
- mipsel-bfk3: Switch to 5.4 kernel, other changes (Thanks iv@)
- oem: Add use/oem/distro
- uboot: Drop BOOTARGS cma=192M
- net: Added switch between NetworkManager (etcnet) and NetworkManager (native)
  Assigned by default NetworkManager (etcnet)
- x11: Not add use/drm to use/x11
- efi: Add check EFIVAR_FS option
- sound/base: Add test-audio
- armh-mcom02: set screen resolution 1366x768
- realtime.mk: Refactoring, drop live with session support
- engineering.mk: Switch to MATE
- x11: Reduce size of kde5
- regular-vm.mk: Set as default un-def kernel flavour, drop lts kernel flavour

Reason: un-def supports booting on RPi4.
lts kernel flavour has not been updated for a long time.

firefox-esr crashes when launched on these architectures (Raspberry Pi 3 only).

With kde5-maxi image is too large (over 2 GB).

live with session support needed efi=runtime for cmdline kernel.
This parameter makes it unsuitable for real-time.

The std-def kernel is already set as the default in use/kernel for
the architectures where it is available.

make-initrd-propagator >= 0.44-alt1 always create alt-live-storage.

Removed from Sisyphus.
See-also:
http://git.altlinux.org/tasks/archive/done/_260/267143
http://git.altlinux.org/tasks/archive/done/_260/267155
http://git.altlinux.org/tasks/archive/done/_260/267170

This script is not needed, since the identical script
features.in/plymouth/rootfs/image-scripts.d/10-plymouth is run
for stage2.

Suggested-by: Seccyfighter

Removed from Sisyphus.
See-also: http://git.altlinux.org/tasks/archive/done/_260/266999

- No need to do double work.
- With screen resolution '1920x1080' there are errors getting EDID when
using fbturbo videodriver. There is a cyclical shift of the screen
image to the right.

It is possible to set a timeout for automatic bootloading via a
variable.

Also-see: https://lists.altlinux.org/pipermail/devel-distro/2021-March/002258.html

Fix framebuffer in kernel rpi-un 5.10.20-alt1.

This is base target, drm not needed.

The default is NetworkManager (etcnet), so need select NetworkManager
(native) mode.

NetworkManager (etcnet) is default now.

NM_CONTROLLED should always be set together with DISABLED;
otherwise, it's possible to reach the state where
DISABLED=no but NM_CONTROLLED=yes, and have the interface
controlled by both NM and etcnet.

firefox not availability for armh and mipsel.

Suggested by mike@.

Firefox-esr segfaults on Rpi3 for unknown reason.

Suggested by iv@: rpcbind is not needed in SL.

It is pulled by use/oem/distro target.

This package for installer only, don't use it on vm/*.
Just explicitly add installer-features, which can be used with
rootfs-installer-features.
This reverts commit 991a0a35.

They are provided by firefox-esr itself now.