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/scripts/mesar.in

@@ -0,0 +1,82 @@
+#! @SHELL@
+
+# 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/>.
+
+if [ "$V" = 2 ]; then
+    set -x
+fi
+
+# parse arguments
+while [ $# -gt 0 ]; do
+    case $1 in
+        (-h|--help)
+        cat <<EOF
+Usage: mesar [OPTION]... COMMAND ARCHIVE-FILE FILE...
+Archiver for MesCC.
+
+Commands:
+  r[ab][f][u]  - replace existing or insert new file(s) into the archive
+  [c]          - do not warn if the library had to be created
+  [D]          - use zero for timestamps and uids/gids (default)
+
+are ignored and assumed to be "crD".
+
+Options:
+  -h,--help           display this help and exit
+  -V,--version        display version information and exit
+EOF
+        exit 0
+            ;;
+        (-V|--version)
+        cat <<EOF
+mesar (GNU Mes) @VERSION@
+EOF
+        exit 0
+        ;;
+        -*) shift
+        ;;
+        *) break
+        ;;
+    esac
+done
+
+command=$1
+shift
+if [ -z "$command" ]; then
+    echo "AR: Usage error: missing command." 1>&2
+    exit 2
+fi
+archive=$1
+shift
+if [ -z "$archive" ]; then
+    echo "AR: Usage error: missing archive" 1>&2
+    exit 2
+fi
+if [ $# -eq 0 ]; then
+    echo "AR: Usage error: missing object files" 1>&2
+    exit 2
+fi
+M1_archive=$(dirname "$archive")/$(basename "$archive" .a).s
+for o in "$@"; do
+    s=$(dirname "$o")/$(basename "$o" .o).s
+    M1_objects="$M1_objects $s"
+done
+mkdir -p $(dirname "$archive")
+cat $M1_objects > "$M1_archive"
+cat "$@" > "$archive"