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-mescc/hello-mes.S

@@ -0,0 +1,40 @@
+### GNU Mes --- Maxwell Equations of Software
+### Copyright © 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/>.
+
+DEFINE sys_exit  01
+DEFINE sys_write 04
+
+:main
+	mov____$i8,%eax !end_hello_message>hello_message
+	mov____%eax,%ecx
+	mov____$i8,%eax !0
+	mov____%eax,%ebx
+	mov____$i8,%eax sys_write
+	int____$0x80
+
+	mov____$i8,%eax !0
+	mov____%eax,%ebx
+	mov____$i8,%eax sys_exit
+	int____$0x80
+
+:ELF_data
+:hello_message
+"Hello, GNU Mes!
+"
+:end_hello_message
+:HEX2_data