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/module/mes/mes-0.scm

@@ -0,0 +1,56 @@
+;;; -*-scheme-*-
+
+;;; GNU Mes --- Maxwell Equations of Software
+;;; Copyright © 2016,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; mes-0.scm: 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/>.
+
+;;; Commentary:
+
+;;; mes-0.scm is the first file being loaded into Guile.  It provides
+;;; non-standard definitions that Mes modules and tests depend on.
+
+;;; Code:
+
+(define-module (mes mes-0)
+  #:export (
+            builtin?
+            mes-use-module
+            EOF
+            append2
+            mes?
+            guile?
+            guile-1.8?
+            guile-2?
+            %arch
+            %compiler
+            ))
+(cond-expand
+ (guile-2)
+ (guile
+  (define %host-type (string-append (utsname:machine (uname)) "linux-gnu")))
+ (else))
+
+(define-macro (mes-use-module . rest) #t)
+(define builtin? procedure?) ; not strictly true, but ok for tests/*.test
+(define mes? #f)
+(define guile? #t)
+(define guile-1.8? (equal? (effective-version) "1.8"))
+(define guile-2? (equal? (major-version) "2"))
+(define EOF (if #f #f))
+(define append2 append)
+(define %arch (car (string-split %host-type #\-)))
+(define %compiler "gnuc")