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/build-aux/build-mes.sh

@@ -0,0 +1,57 @@
+#! /bin/sh
+
+# 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/>.
+
+set -e
+set -u
+
+V=${V-}
+
+if [ "$V" = 2 ]; then
+    set -x
+fi
+
+. ./config.sh
+. ${srcdest}build-aux/trace.sh
+. ${srcdest}build-aux/cc.sh
+
+trap 'test -f .log && cat .log' EXIT
+
+mes_sources="
+src/gc.c
+src/hash.c
+src/lib.c
+src/math.c
+src/mes.c
+src/module.c
+src/posix.c
+src/reader.c
+src/string.c
+src/struct.c
+src/vector.c
+"
+
+for c in $mes_sources; do
+    compile $c
+done
+if test $mes_libc = system; then
+    LIBS=-lmes
+fi
+link bin/mes-$compiler
+cp bin/mes-$compiler bin/mes