Add mes and mescc-tools-extra

mescc-tools-extra contains two important tools:
- cp
- chmod

mes first builds itself from a mes 0.21 seed as used by guix, and then
builds a mes 0.22 and then mes 0.22 using that created mes 0.22.

It does /not/ use bootstrap.sh as we don't have a proper shell at this
point, it has been manually adapted for kaem.

sysa/mes-bins/mescc.scm

@@ -0,0 +1,46 @@
+#! /gnu/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-guile-2.2.6/bin/guile \
+--no-auto-compile -e main -L /gnu/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-mes-minimal-0.21/share/guile/site/2.2 -C /gnu/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-mes-minimal-0.21/lib/guile/2.2/site-ccache -s
+!#
+;;; GNU Mes --- Maxwell Equations of Software
+;;; Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of GNU Mes.
+;;;
+;;; GNU Mes is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Mes is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+
+(cond-expand
+ (mes)
+ (guile
+  (define %arch (car (string-split %host-type #\-)))))
+
+(setenv "%prefix" (or (getenv "MES_PREFIX")
+                      (if (string-prefix? "@prefix" "/gnu/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-mes-minimal-0.21")
+                          ""
+                          "/gnu/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-mes-minimal-0.21")))
+
+(setenv "%version" (if (string-prefix? "@VERSION" "0.21") "git"
+                       "0.21"))
+
+(setenv "%arch" (if (string-prefix? "@mes_cpu" "x86") %arch
+                       "x86"))
+
+(cond-expand
+ (mes
+  (mes-use-module (mescc))
+  (mescc:main (command-line)))
+ (guile
+  (use-modules (mescc))))
+
+(define (main args)
+  (mescc:main args))