Support reboot in non-chroot modes using grub and an init script

We use grub-2.06 as 2.12 has some packaging issues, and can't be
built in live-bootstrap for now.

steps/grub-2.06/import-gnulib.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+# SPDX-FileCopyrightText: 2021 Melg Eight <public.melg8@gmail.com>
+# SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
+# SPDX-FileCopyrightText: 2024 Gábor Stefanik <netrolller.3d@gmail.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Regenerate unicode files
+pushd ../gnulib-d271f86/lib
+gcc -Iunictype -o gen-uni-tables gen-uni-tables.c
+mv ../../*.txt .
+./gen-uni-tables UnicodeData-9.0.0.txt PropList-9.0.0.txt DerivedCoreProperties-9.0.0.txt ArabicShaping-9.0.0.txt Scripts-9.0.0.txt Blocks-9.0.0.txt PropList-3.0.1.txt EastAsianWidth-9.0.0.txt LineBreak-9.0.0.txt WordBreakProperty-9.0.0.txt GraphemeBreakProperty-9.0.0.txt CompositionExclusions-9.0.0.txt SpecialCasing-9.0.0.txt CaseFolding-9.0.0.txt 9.0
+popd
+
+../gnulib-d271f86/gnulib-tool --import --local-dir=gl \
+  --lib=libgnu \
+  --source-base=grub-core/lib/gnulib \
+  --m4-base=m4 \
+  --doc-base=doc \
+  --tests-base=tests \
+  --aux-dir=build-aux \
+  --no-conditional-dependencies \
+  --no-libtool \
+  --macro-prefix=gl \
+  --no-vc-files \
+  argp \
+  base64 \
+  error \
+  fnmatch \
+  getdelim \
+  getline \
+  gettext-h \
+  gitlog-to-changelog \
+  mbswidth \
+  progname \
+  realloc-gnu \
+  regex \
+  save-cwd