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/trace.sh

@@ -0,0 +1,49 @@
+# GNU Mes --- Maxwell Equations of Software
+# Copyright © 2018 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/>.
+
+LOG=
+if [ -z "$V" -o "$V" = 0 ]; then
+    trace () {
+        echo "  $1"
+        shift
+        echo "$@" >> build.log
+        eval "$@ $LOG"
+        cat .log 1>&2
+        cat .log >> build.log
+    }
+    LOG=" >.log 2>&1"
+fi
+if [ "$V" = 1 ]; then
+    trace () {
+        shift
+        echo "$@"
+        echo "$@" >> build.log
+        eval "$@ $LOG"
+        cat .log 1>&2
+        cat .log >> build.log
+    }
+    LOG=" >.log 2>&1"
+fi
+if [ "$V" = 2 ]; then
+    set -x
+    trace () {
+        shift
+        echo "$@" >> build.log
+        eval "$@"
+    }
+fi