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/tar-1.12/files/getdate_stub.c

@@ -0,0 +1,12 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "getdate.h"
+
+time_t get_date (const char *p, const time_t *now)
+{
+    return 0;
+}

steps/tar-1.12/files/stat_override.c

@@ -0,0 +1,29 @@
+/*
+ * SPDX-FileCopyrightText: 2022 fosslinux <fosslinux@aussies.space>
+ * SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <sys/stat.h>
+#include <linux/syscall.h>
+#include <linux/x86/syscall.h>
+
+int _lstat(const char *path, struct stat *buf) {
+	int rc = lstat(path, buf);
+	if (rc == 0) {
+		buf->st_atime = 0;
+		buf->st_mtime = 0;
+	}
+	return rc;
+}
+
+/* stat is deliberately hacked to be lstat.
+   In src/system.h tar already defines lstat to be stat
+   since S_ISLNK is not defined in mes C library
+   Hence, we can't use something like #define lstat(a,b) _lstat(a,b)
+   to have separate stat and lstat functions.
+   Thus here we break tar with --dereference option but we don't use
+   this option in live-bootstrap.
+ */
+#define stat(a,b) _lstat(a,b)