Remove portable_endian.h

/* Subset of Mathias Panzenböck's portable endian code, public domain */

#ifndef __PORTABLE_ENDIAN_H__

#define __PORTABLE_ENDIAN_H__

#if defined(__linux__) || defined(__CYGWIN__)

#	include <endian.h>

#elif defined(__OpenBSD__)

#	include <sys/endian.h>

#elif defined(__APPLE__)

#	include <libkern/OSByteOrder.h>

#	define htole64(x) OSSwapHostToLittleInt64(x)

#	define le64toh(x) OSSwapLittleToHostInt64(x)

#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)

#	include <sys/endian.h>

#	ifndef le64toh

#		define le64toh(x) letoh64(x)

#	endif

#elif defined(__sun) && defined(__SVR4)

#	include <sys/byteorder.h>

#	define htole64(x) LE_64(x)

#	define le64toh(x) LE_64(x)

#elif defined(_WIN16) || defined(_WIN32) || defined(_WIN64) || defined(__WINDOWS__)

#	include <winsock2.h>

#	include <sys/param.h>

#	if BYTE_ORDER == LITTLE_ENDIAN

#		define htole64(x) (x)

#		define le64toh(x) (x)

#	elif BYTE_ORDER == BIG_ENDIAN

#		define htole64(x) __builtin_bswap64(x)

#		define le64toh(x) __builtin_bswap64(x)

#	else

#		error byte order not supported

#	endif

#else

#	error platform not supported

#endif

#endif // __PORTABLE_ENDIAN_H__

#define _DEFAULT_SOURCE 1

#endif

#include "portable_endian.h"

#include <stdlib.h>

#if defined(__ARM_NEON__)