Remove the notion of "sys*"

- This idea originates from very early in the project and was, at the
  time, a very easy way to categorise things.
- Now, it doesn't really make much sense - it is fairly arbitary, often
  occuring when there is a change in kernel, but not from builder-hex0
  to fiwix, and sysb is in reality completely unnecessary.
- In short, the sys* stuff is a bit of a mess that makes the project
  more difficult to understand.
- This puts everything down into one folder and has a manifest file that
  is used to generate the build scripts on the fly rather than using
  coded scripts.
- This is created in the "seed" stage.

stage0-posix -- (calls) --> seed -- (generates) --> main steps

Alongside this change there are a variety of other smaller fixups to the
general structure of the live-bootstrap rootfs.

- Creating a rootfs has become much simpler and is defined as code in
  go.sh. The new structure, for an about-to-be booted system, is

/
-- /steps (direct copy of steps/)
-- /distfiles (direct copy of distfiles/)
-- all files from seed/*
-- all files from seed/stage0-posix/*

- There is no longer such a thing as /usr/include/musl, this didn't
  really make any sense, as musl is the final libc used. Rather, to
  separate musl and mes, we have /usr/include/mes, which is much easier
  to work with.
- This also makes mes easier to blow away later.
- A few things that weren't properly in packages have been changed;
  checksum-transcriber, simple-patch, kexec-fiwix have all been given
  fully qualified package names.
- Highly breaking change, scripts now exist in their package directory
  but NOT WITH THE packagename.sh. Rather, they use pass1.sh, pass2.sh,
  etc. This avoids manual definition of passes.
  - Ditto with patches; default directory is patches, but then any patch
    series specific to a pass are named patches-passX.

steps/musl-1.2.4/pass3.sh

@@ -0,0 +1,46 @@
+# SPDX-FileCopyrightText: 2022 Dor Askayo <dor.askayo@gmail.com>
+# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_configure() {
+    ./configure \
+        --host=i386-unknown-linux-musl \
+        --prefix="${PREFIX}" \
+        --libdir="${LIBDIR}" \
+        --includedir="${PREFIX}/include/"
+}
+
+src_compile() {
+    make "${MAKEJOBS}" CROSS_COMPILE=
+}
+
+src_install() {
+    default
+
+    # Make dynamic linker symlink relative in ${PREFIX}/lib
+    rm "${DESTDIR}/lib/ld-musl-i386.so.1"
+    rmdir "${DESTDIR}/lib"
+    mkdir -p "${DESTDIR}${PREFIX}/lib"
+    ln -sr "${DESTDIR}${LIBDIR}/libc.so" "${DESTDIR}${PREFIX}/lib/ld-musl-i386.so.1"
+
+    # Make startup objects available in /usr/lib
+    # Expected by GCC 10+
+    for i in crt1.o crti.o crtn.o Scrt1.o rcrt1.o; do
+        ln -sr "${DESTDIR}${LIBDIR}/${i}" "${DESTDIR}${PREFIX}/lib/${i}"
+    done
+
+    # Add symlink for ldd
+    mkdir -p "${DESTDIR}${PREFIX}/bin"
+    ln -s ../lib/ld-musl-i386.so.1 "${DESTDIR}${PREFIX}/bin/ldd"
+
+    # Add library search path configurtion
+    mkdir -p "${DESTDIR}/etc"
+    cp ld-musl-i386.path "${DESTDIR}/etc"
+}
+
+src_postprocess() {
+    # Stripping libc can cause some strange brokenness
+    :
+}