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/bzip2-1.0.8/patches/coreutils.patch

@@ -0,0 +1,41 @@
+SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+SPDX-FileCopyrightText: 2021 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: bzip2-1.0.6
+
+Disable all coreutils calls in the Makefile which we do not have at this
+point of the bootstrap. ranlib can be unconditionally disabled as we do not
+have it either.
+
+diff -r -N -U3 Makefile Makefile
+--- Makefile	2019-07-13 18:50:05.000000000 +0100
++++ Makefile	2021-01-14 15:45:17.558516299 +0000
+@@ -21,7 +21,7 @@
+ LDFLAGS=
+ 
+ BIGFILES=-D_FILE_OFFSET_BITS=64
+-CFLAGS=-Wall -Winline -O2 -g $(BIGFILES)
++CFLAGS=-Wall -Winline -O2 -g $(BIGFILES) -I .
+ 
+ # Where you want it installed when you do 'make install'
+ PREFIX=/usr/local
+@@ -44,11 +44,6 @@
+ 
+ libbz2.a: $(OBJS)
+ 	$(AR) cq libbz2.a $(OBJS)
+-	@if ( test -f $(RANLIB) -o -f /usr/bin/ranlib -o \
+-		-f /bin/ranlib -o -f /usr/ccs/bin/ranlib ) ; then \
+-		echo $(RANLIB) libbz2.a ; \
+-		$(RANLIB) libbz2.a ; \
+-	fi
+ 
+ check: test
+ test: bzip2
+@@ -114,7 +108,6 @@
+ 	sample1.tst sample2.tst sample3.tst
+ 
+ blocksort.o: blocksort.c
+-	@cat words0
+ 	$(CC) $(CFLAGS) -c blocksort.c
+ huffman.o: huffman.c
+ 	$(CC) $(CFLAGS) -c huffman.c