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/tests/scaffold/43-for-do-while.c

@@ -0,0 +1,90 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2017,2018 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/>.
+ */
+
+#include <mes/lib-mini.h>
+
+int
+main ()
+{
+  int i = 0;
+  int f = 0;
+  int t = 1;
+  int one = t;
+  char *p = "mes";
+
+  oputs ("\n");
+
+  oputs ("t: for (i=1; i<5; ++i)\n");
+  for (i = 1; i < 5; ++i)
+    ;
+  if (i != 5)
+    return i;
+
+  oputs ("t: while (i<3) i++\n");
+  i = 1;
+  while (i < 3)
+    i++;
+  if (i != 3)
+    return i;
+
+  oputs ("t: do i-- while (i>0)\n");
+  do
+    i--;
+  while (i > 0)
+  ;
+  if (i != 0)
+    return 1;
+
+  oputs ("t: while (1) break;\n");
+  while (1)
+    break;
+
+  oputs ("t: while (1) ... break;\n");
+  while (1)
+    {
+      f = 0;
+      break;
+    }
+
+  oputs ("t: while (1) {while (1) break;break;}\n");
+  while (1)
+    {
+      while (1)
+        break;
+      break;
+    }
+
+  oputs ("t: while () {continue;...}\n");
+  while (one--)
+    {
+      continue;
+      one = 1;
+    }
+  one += 2;
+
+  oputs ("t: while (1) { goto label; };\n");
+  while (1)
+    {
+      goto ok1;
+    }
+ok1:
+
+  return 0;
+}