qemu-guest-agnet is now available in sisyphus_riscv64.

riscv64 port becomes steadily becomes bigger, better
and more complete. This commit updates the package
lists to remove exceptions for software that is
now available from sisyphus_riscv64.

Note that no point is made regarding usability or
necessity of this software for particular riscv64
images; and all this software was not fully tested.
This commit is just a statement that these exceptions
are no longer necessary in order to build an image.
The release managers may want to go through the lists
and exclude something again when it comes to building
and testing actual release images.

In the current state it does not do anything useful,
just lets systemd spam in logs.

Now LibreOffice is availalbe in sisyphus_riscv64,
let's use it like all the other platforms do.

Note that LibreOffice-still is not yet available
in sisyphus_riscv64, so riscv64 joins e2k in
selecting LibreOffice for use/office/LibreOffice/still.

Now that firefox is available in sisyphus_riscv64,
let's use it as our default browser.

Note that firefox-esr is not yet available, so now on
riscv64 firefox is selected for use/browser/firefox-esr.

- alt-workstation-cloud: Use NetworkManager (from obirvalger@)
- install2: Don't cleanup /lib/modules/*/kernel/arch (from jqt4@)
- alt-server: add commits from jqt4@
- kworkstation: add commitd from zerg@
- grub: drop kazakh language support
- efi: add workaround for p10 branch to fix booting from a flash drive
- grub: do not copy locale, if not used gfxterm

Some of the native libraries used by jitsi-meet
(eg libjnisctp.so libjitsisrtp.so) are only compiled
for the x86_64 architecture.
As a consequence, jitsi-meet cannot run properly
on architectures other than x86_64.

See-also: https://bugzilla.altlinux.org/44327
See-also: https://bugzilla.altlinux.org/44494
See-also: https://bugzilla.altlinux.org/44496

It is needed for qemu-device-display-virtio-vga on aarch64

No need to hope that will add package grub-common to stage1 only
together with branding. With terminal_output=console, non-ASCII
characters are not displayed.

Kazakh language is not supported in alterator-sysconfig.

The vbox-guest and vbox-host lists contain x86-only packages.
An alt-server image is not planned for i586.
The groups "VirtualBox Guest Additions" and "VirtualBox for host
system" will only be created in the image for x86_64, since for
other architectures they will remain empty, which is undesirable.