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/guile-3.0.9/sources

@@ -0,0 +1,5 @@
+https://mirrors.kernel.org/gnu/guile/guile-3.0.7.tar.xz f57d86c70620271bfceb7a9be0c81744a033f08adc7ceba832c9917ab3e691b7
+https://mirrors.kernel.org/gnu/guile/guile-3.0.9.tar.xz 1a2625ac72b2366e95792f3fe758fd2df775b4044a90a4a9787326e66c0d750d 
+https://git.savannah.gnu.org/cgit/gnulib.git/snapshot/gnulib-901694b9.tar.gz f9aad85de1f41d57c9368d304020ffbf354a5e56db1297f022c3d12181134e56
+https://git.savannah.gnu.org/cgit/gnulib.git/snapshot/gnulib-356a414e.tar.gz fc9973f1a9243fdc4b98d33d7704f3c71bfdc4c2ef96899b8f28cade7290a714
+https://github.com/schierlm/guile-psyntax-bootstrapping/archive/refs/tags/guile-3.0.7.tar.gz 14cda9c416506dfadf60c14fc623ff01ef99b87564a78d0a29c5d17143c97609