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/include/getopt.h

@@ -0,0 +1,62 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
+ * 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/>.
+ */
+#ifndef __MES_GETOPT_H
+#define __MES_GETOPT_H 1
+
+#if SYSTEM_LIBC
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#undef __MES_GETOPT_H
+#include_next <getopt.h>
+
+#else // ! SYSTEM_LIBC
+#include <endian.h>
+int isdigit (int);
+int isxdigit (int);
+
+char *optarg;
+int optind;
+int opterr;
+struct option
+{
+  char const *name;
+  int has_arg;
+  int *flag;
+  int val;
+};
+
+enum _argtype
+{
+  no_argument,
+  required_argument,
+  optional_argument
+};
+
+int getopt (int argc, char *const *argv, char const *options);
+int getopt_long (int argc, char *const *argv, char const *options,
+                 struct option const *long_options, int *opt_index);
+int getopt_long_only (int argc, char *const *argv, char const *options,
+                      struct option const *long_options, int *opt_index);
+
+#endif // ! SYSTEM_LIBC
+
+#endif // __MES_GETOPT_H