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/lib/linux/x86-mes/elf32-0hello-mes.hex2

@@ -0,0 +1,53 @@
+### GNU Mes --- Maxwell Equations of Software
+### Copyright © 2017,2019 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/>.
+
+### Commentary:
+
+# elf32-0hello-mes.hex2: `Hello, GNU Mes!' for i686-linux written in
+# hex2 assembly, for usage with elf32-0header.hex2.  This produces a
+# 160-byte binary (a0 hex).  Inspiration was taken from GNU Gcc output
+# of hello-mes.S.
+
+### Code:
+
+# @60
+:ELF_text
+
+                               # print <hello>
+b8 04 00 00 00                 # mov    $4,%eax
+bb 00 00 00 00                 # mov    $1,%ebx
+b9 &hello                      # mov    $hello,%ecx
+ba %bye>hello                  # mov    $(bye-hello),%edx
+cd 80                          # int    $0x80
+
+                               # exit 0
+b8 01 00 00 00                 # mov    $1,%eax
+bb 00 00 00 00                 # mov    $0,%ebx
+cd 80                          # int    $0x80
+f4                             # hlt
+
+00 00 00 00 00 00 00 00 00 00  # align to @90
+00 00 00
+
+# @90
+:ELF_data
+:hello
+48 65 6c 6c 6f 2c 20 47        # Hello, G
+4e 55 20 4d 65 73 21 0a        # NU Mes!\n
+:bye
+:ELF_end