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/perl-5.6.2/pass1.sh

@@ -0,0 +1,46 @@
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+# SPDX-FileCopyrightText: 2022 fosslinux <fosslinux@aussies.space>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    default
+
+    # Regenerate bison files
+    sed -i '/yydestruct/d' perly.y
+    rm -f perly.c perly.h
+    bison -d perly.y
+    mv perly.tab.c perly.c
+    mv perly.tab.h perly.h
+
+    # Regenerate other prebuilt header files
+    for file in embed keywords opcode; do
+        rm -f ${file}.h
+        perl ${file}.pl
+    done
+    rm -f regnodes.h
+    perl regcomp.pl
+    rm -f ext/ByteLoader/byterun.h ext/ByteLoader/byterun.c
+    perl bytecode.pl
+    rm -f warnings.h lib/warnings.pm
+    perl warnings.pl
+
+    # Workaround for some linking problems, remove if possible
+    sed -i 's/perl_call_method/Perl_call_method/' ext/Data/Dumper/Dumper.xs
+    sed -i 's/perl_call_sv/Perl_call_sv/' ext/Data/Dumper/Dumper.xs
+    sed -i 's/sv_setptrobj/Perl_sv_setref_iv/' ext/POSIX/POSIX.xs
+
+    # We are using non-standard locations
+    sed -i "s#/usr/include/errno.h#${PREFIX}/include/bits/errno.h#" ext/Errno/Errno_pm.PL
+}
+
+src_compile() {
+    make -j1 PREFIX="${PREFIX}"
+}
+
+src_install() {
+    # Remove old perl
+    rm -rf "${PREFIX}"/lib/perl5/
+
+    default
+}