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-1.1.24/patches/va_list.patch

@@ -0,0 +1,41 @@
+SPDX-FileCopyrightText: 2019 Giovanni Mascellani <gio@debian.org>
+
+SPDX-License-Identifier: MIT
+
+From 1642f5982009e110615a29745f9cafd51a5c1597 Mon Sep 17 00:00:00 2001
+From: Giovanni Mascellani <gio@debian.org>
+Date: Tue, 11 Jun 2019 11:20:07 +0200
+Subject: [PATCH] stdarg.h: add support for tcc.
+
+---
+ arch/i386/bits/alltypes.h.in | 14 +++++++++++++-
+ 1 file changed, 13 insertions(+), 1 deletion(-)
+
+diff --git a/arch/i386/bits/alltypes.h.in b/arch/i386/bits/alltypes.h.in
+index 1a8432d3..44cb5987 100644
+--- arch/i386/bits/alltypes.h.in
++++ arch/i386/bits/alltypes.h.in
+@@ -2,7 +2,19 @@
+ #define _Int64 long long
+ #define _Reg int
+ 
+-#if __GNUC__ >= 3
++#ifdef __TINYC__
++typedef char *__builtin_va_list;
++#define __builtin_va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+3)&~3)
++#define __builtin_va_arg(ap,type) (ap += (sizeof(type)+3)&~3, *(type *)(ap - ((sizeof(type)+3)&~3)))
++#define __builtin_va_copy(dest, src) (dest) = (src)
++#define __builtin_va_end(ap)
++#ifndef __TINYC_redefine_va_list
++#define __TINYC_redefine_va_list
++#undef __DEFINED_va_list
++#endif
++#endif
++
++#if __GNUC__ >= 3 || defined(__TINYC__)
+ TYPEDEF __builtin_va_list va_list;
+ TYPEDEF __builtin_va_list __isoc_va_list;
+ #else
+-- 
+GitLab
+