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/mes/lib-mini.h

@@ -0,0 +1,98 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2016,2017,2018 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_LIB_MINI_H
+#define __MES_LIB_MINI_H
+
+#if HAVE_CONFIG_H
+#include <mes/config.h>
+#endif
+
+// CONSTANT STDIN 0
+#ifndef STDIN
+#define STDIN 0
+#endif
+
+// CONSTANT STDOUT 1
+#ifndef STDOUT
+#define STDOUT 1
+#endif
+
+// CONSTANT STDERR 2
+#ifndef STDERR
+#define STDERR 2
+#endif
+
+char **environ;
+int __stdin;
+int __stdout;
+int __stderr;
+
+int eputs (char const *s);
+int puts (char const *s);
+int oputs (char const *s);
+
+#if SYSTEM_LIBC
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#else //!SYSTEM_LIBC
+
+#ifndef _SIZE_T
+#define _SIZE_T
+#ifndef __SIZE_T
+#define __SIZE_T
+#ifndef __MES_SIZE_T
+#define __MES_SIZE_T
+#undef size_t
+typedef unsigned long size_t;
+#endif
+#endif
+#endif
+
+#ifndef _SSIZE_T
+#define _SSIZE_T
+#ifndef __SSIZE_T
+#define __SSIZE_T
+#ifndef __MES_SSIZE_T
+#define __MES_SSIZE_T
+#undef ssize_t
+#if __i386__
+typedef int ssize_t;
+#else
+typedef long ssize_t;
+#endif
+#endif
+#endif
+#endif
+
+#ifndef __MES_ERRNO_T
+#define __MES_ERRNO_T 1
+typedef int error_t;
+int errno;
+#endif // !__MES_ERRNO_T
+
+size_t strlen (char const *s);
+ssize_t _write ();
+ssize_t write (int filedes, void const *buffer, size_t size);
+#endif // !SYSTEM_LIBC
+
+#endif //__MES_LIB_MINI_H