/usr/include/x86_64-linux-gnu/bits/endian.h is in libc6-dev 2.23-0ubuntu3.
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 | /* i386/x86_64 are little-endian. */
#ifndef _ENDIAN_H
# error "Never use <bits/endian.h> directly; include <endian.h> instead."
#endif
#define __BYTE_ORDER __LITTLE_ENDIAN
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