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/gnu/hurd.h

@@ -0,0 +1,84 @@
+/*
+ * 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/>.
+ */
+
+#ifndef __MES_GNU_HURD_H
+#define __MES_GNU_HURD_H
+
+#define _GNU_SOURCE 1
+#define __USE_GNU 1
+
+#include <errno.h>
+#include <sys/types.h>
+
+#ifndef _BITS_TYPES_H
+#ifndef _LOFF_T
+#define _LOFF_T
+typedef off64_t loff_t;
+#endif
+#endif
+
+#include <mach/mach_types.h>
+#include <mach/message.h>
+#include <mach/port.h>
+
+struct hurd_startup_data
+  {
+    int flags;
+
+    mach_port_t *dtable;
+    mach_msg_type_number_t dtable_count;
+
+    char *argp;
+    int arg_size;
+
+    char *envp;
+    int env_size;
+
+    mach_port_t *portarray;
+    mach_msg_type_number_t portarray_count;
+
+    int *intarray;
+    mach_msg_type_number_t intarray_count;
+
+    vm_address_t stack_base;
+    vm_size_t stack_count;
+
+    vm_address_t phdr;
+    vm_size_t phdr_count;
+
+    vm_address_t user_entry;
+  };
+
+#define _HURD_DTABLE_MAX 1024
+extern mach_port_t _hurd_dtable[_HURD_DTABLE_MAX];
+extern int _hurd_dtable_count;
+extern struct hurd_startup_data _hurd_startup_data;
+
+#define _HURD_ARGV_MAX 1000
+#define _HURD_ENVV_MAX 1000
+extern size_t __argc;
+extern char *__argv[_HURD_ARGV_MAX];
+extern char *__envv[_HURD_ENVV_MAX];
+
+mach_port_t fd_get (int filedes);
+error_t fd_write (mach_port_t port, void const *buffer, size_t *size, loff_t offset);
+error_t fd_read (mach_port_t port, void *buffer, size_t *size, loff_t offset);
+
+#endif // __MES_GNU_HURD_H