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.

sysa/bash-2.05b/patches/tinycc.patch

@@ -1,30 +0,0 @@
-SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
-
-SPDX-License-Identifier: GPL-2.0-or-later
-
-int name, namelen; is wrong for mes libc, it is char* name, so we modify tinycc
-to reflect this.
-
-diff --git lib/sh/oslib.c lib/sh/oslib.c
-index 90d7be9..37fdf2a 100644
---- lib/sh/oslib.c
-+++ lib/sh/oslib.c
-@@ -192,8 +192,7 @@ bzero (s, n)
- #    include <sys/utsname.h>
- int
- gethostname (name, namelen)
--     char *name;
--     int namelen;
-+     char *name; int namelen;
- {
-   int i;
-   struct utsname ut;
-@@ -209,7 +208,7 @@ gethostname (name, namelen)
- #  else /* !HAVE_UNAME */
- int
- gethostname (name, namelen)
--     int name, namelen;
-+     char* name; int namelen;
- {
-   strncpy (name, "unknown", namelen);
-   name[namelen] = '\0';