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-0.22/scripts/mescc.scm.in

@@ -0,0 +1,72 @@
+#! @GUILE@ \
+--no-auto-compile -e main -L @guile_site_dir@ -C @guile_site_ccache_dir@ -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 #\-)))
+  (define %kernel (car (filter
+                        (compose not
+                                 (lambda (x) (member x '("pc" "portbld" "unknown"))))
+                        (cdr (string-split %host-type #\-)))))))
+
+(define %prefix (or (getenv "MES_PREFIX")
+                      (if (string-prefix? "@prefix" "@prefix@")
+                          ""
+                          "@prefix@")))
+
+(define %includedir (or (getenv "includedir")
+                        (string-append %prefix "/include")))
+
+(define %libdir (or (getenv "libdir")
+                    (string-append %prefix "/lib")))
+
+(define %version (if (string-prefix? "@VERSION" "@VERSION@") "git"
+                     "@VERSION@"))
+
+(define %arch (if (string-prefix? "@mes_cpu" "@mes_cpu@") %arch
+                  "@mes_cpu@"))
+
+(define %kernel (if (string-prefix? "@mes_kernel" "@mes_kernel@") %kernel
+                    "@mes_kernel@"))
+
+(define %numbered-arch? (if (getenv "numbered_arch") (and=> (getenv "numbered_arch")
+                                                            (lambda (x) (equal? x "true")))
+                            (if (string-prefix? "@numbered_arch" "@numbered_arch@") #f
+                                (equal? "@numbered_arch@" "true"))))
+
+(setenv "%prefix" %prefix)
+(setenv "%includedir" %includedir)
+(setenv "%libdir" %libdir)
+(setenv "%version" %version)
+(setenv "%arch" %arch)
+(setenv "%kernel" %kernel)
+(setenv "%numbered_arch" (if %numbered-arch? "true" "false"))
+
+(cond-expand
+ (mes
+  (mes-use-module (mescc))
+  (mescc:main (command-line)))
+ (guile
+  (use-modules (mescc))))
+
+(define (main args)
+  (mescc:main args))