This is meant to provide failsafe configuration by default,
at least until mga2 works reliably for me.

None of Elbrus systems I had a chance to use as root
had any problems regarding TRIM feature of SSDs these
used to carry/support; let's start with e2k and maybe
carry over to x86 later.

Elbrus 101-PC was initially supported through kernel
modesetting driver only, now it's got a sort of native
driver running on ALT too.

...which will only result in a FAILED message,
most probably the solitary one throughout the
whole sysvinit boot.

The goal was simple: every use/e2k/{x11,install2}/$MACHINE
must be self-sufficient regarding platform support, that is
it must depend on the corresponding CPU-specific target.

A bit less make-tech but still better overall.

NB: llvm cleanup is not needed anymore after upgrade to
    Mesa-17/llvm-3.7, should be dropped like this year.

Forgot to do that before merging, sorry.

(xorg-drv-ati cares for dependencies
but we still prefer modesetting driver
in the installers to make them versatile)

Elbrus-801 and -101 are now added; 401's support refactored
and modified to cover 4.4 server system as well.

Weird it got overlooked in the first place.

Radeon HDMI as the default soundcard isn't really optimal,
and trying to push 44100 kHz samples towards 48 kHz interface
isn't going to sound great; provide sane ALSA dmix defaults
for Elbrus-401 PC workstation.

The early builds used to rely upon a non-committed
rootfs/files/etc/X11/xorg.conf within this feature
which was a bit annoying and would have screwed an
Elbrus system based on any other GPU.

So let's provide some flexibility by packaging it.

Elbrus 2000 only takes us a few lines to get up and running ;-)