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Minor changes necessary to support EFI on RISC-V.

Currently, this bootloader is not set automatically and needs to be set
manually using the BOOTLOADER environment variable, e.g.:

	BOOTLOADER=u-boot setup-disk -m sys /dev/sda

Furthermore, it relies on the update-u-boot script to install the
bootloader based on the automatically determined defaults.

fixes aports#10526

fixes #10468

now that video ddx is not installed, glamor is usually enabled, which
requires mesa (nvidia is not officially supported on alpine). as before,
this is a simple script, so no configuration is provided. users who
don't want udev or mesa should invoke apk manually.

-nopad squashfs files cannot be mounted by Linux kernel.

Fixes: 30e6933e ("update-kernel: use -nopad -Xbcj for modloop")

reduces x86 modloop size by about 38k. -all-time 0 reduces by 300 bytes
more, but probably more confusing than it's worth

This makes it convienient to install alpine to disk on rpi or other
devices with mmc.

add function for y/n questions

use `ask` for consistency

allow set default answer via env var APKREPOS_DEFAULT_ANSWER

repeat the question til we get a valid answer

set partition type to 0c when boot partition is vfat. RPI wont boot
otherwise.

disable swap for rpi

rename select_bootloader to select_bootloader_pkg as it selects the
bootloader package.

syslinux only works on x86 and x86_64

RPI kernels store the DTBS directly under /boot so they can handle
kernel upgrades.

fixes #10462

fixes #10461

Thanks to Timo Ketola for the fix.