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/gzip-1.2.4/pass1.kaem

@@ -0,0 +1,60 @@
+#!/bin/sh
+
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-FileCopyrightText: 2021-22 fosslinux <fosslinux@aussies.space>
+# SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+set -ex
+
+# Check tarball checksums
+checksum-transcriber sources
+sha256sum -c sources.SHA256SUM
+
+mkdir build src
+cd build
+
+# Extract
+ungz --file ${DISTFILES}/${pkg}.tar.gz --output ../src/${pkg}.tar
+untar --file ../src/${pkg}.tar
+rm ../src/${pkg}.tar
+cd ${pkg}
+
+# Prepare
+cp ../../mk/main.mk Makefile
+catm gzip.c.new ../../files/stat_override.c gzip.c
+cp gzip.c.new gzip.c
+
+# Remove generated crc table from util.c
+patch -Np0 -i ../../patches/removecrc.patch
+
+# Since IO redirection is not available yet, patch makecrc.c so that it writes
+# C code to file crc.c that can be appended to util.c
+patch -Np0 -i ../../patches/makecrc-write-to-file.patch
+
+tcc -static -o makecrc sample/makecrc.c
+./makecrc
+catm util.c.new util.c crc.c
+cp util.c.new util.c
+
+# Build
+make
+
+# Install
+cp gzip ${BINDIR}/gzip
+cp gzip ${BINDIR}/gunzip
+chmod 755 ${BINDIR}/gzip
+chmod 755 ${BINDIR}/gunzip
+
+cd ../..
+
+# Checksums
+if match x${UPDATE_CHECKSUMS} xTrue; then
+    sha256sum -o ${pkg}.checksums \
+        /usr/bin/gzip
+
+    cp ${pkg}.checksums ${SRCDIR}
+else
+    sha256sum -c ${pkg}.checksums
+fi