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/71-struct-array.c

@@ -0,0 +1,94 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2017 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.h>
+#include <stdio.h>
+#include <string.h>
+
+struct foo;
+
+struct foo *krak;
+
+typedef struct foo foo_struct;
+
+struct foo
+{
+  int bar[2];
+  char name[10];
+};
+
+struct foo g_foo;
+
+int a, b;
+int i, *j;
+int *k = 0, l;
+
+typedef struct baz
+{
+  int bar;
+  //struct baz *f, *g;
+  struct baz *f;
+  struct baz *g;
+} baz;
+
+int
+main ()
+{
+  foo_struct f;
+  f.bar[0] = 0x22;
+  f.bar[1] = 0x34;
+
+  printf ("eentje: %d\n", f.bar[0]);
+  printf ("tweetje: %d\n", f.bar[1]);
+
+  int *pf = &f;
+  if (*pf != 0x22)
+    return 1;
+  if (*(pf + 1) != 0x34)
+    return 2;
+
+  struct foo *g = &f;
+  printf ("punter eentje: %d\n", g->bar[0]);
+  printf ("punter tweetje: %d\n", g->bar[1]);
+
+  char *strings[] = { "one\n", "two\n", "three\n", NULL };
+  char **p = strings;
+  while (*p)
+    oputs (*p++);
+  if (strcmp (strings[1], "two\n"))
+    return 3;
+
+  strcpy (f.name, "hallo\n");
+  oputs (f.name);
+
+  struct foo fu;
+  strcpy (fu.name, "hello\n");
+  oputs (fu.name);
+
+  strcpy (g_foo.name, "hey\n");
+  oputs (g_foo.name);
+
+  char buf[10];
+  struct foo *s = &buf;
+  strcpy (s->name, "hi\n");
+  oputs (s->name);
+
+  return 0;
+}