/usr/mipsisa32r6-linux-gnu/include/bits/errno.h is in libc6-dev-mipsr6-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | /* Error constants.  MIPS/Linux specific version.
   Copyright (C) 1996-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
   The GNU C Library 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
   Lesser General Public License for more details.
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */
#ifndef _BITS_ERRNO_H
#if !defined _ERRNO_H
# error "Never include <bits/errno.h> directly; use <errno.h> instead."
#endif
# include <linux/errno.h>
/* Older Linux headers do not define these constants.  */
# ifndef ENOTSUP
#  define ENOTSUP		EOPNOTSUPP
# endif
# ifndef ECANCELED
#  define ECANCELED		158
# endif
# ifndef EOWNERDEAD
#  define EOWNERDEAD		165
# endif
# ifndef ENOTRECOVERABLE
#  define ENOTRECOVERABLE	166
# endif
# ifndef ERFKILL
#  define ERFKILL		167
# endif
# ifndef EHWPOISON
#  define EHWPOISON		168
# endif
#endif /* bits/errno.h.  */
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