AIX lacks be16toh, htobe64 and alike

[AIIleG]

Adding the following to include/compat/endian.h worked for me:

#if defined _AIX /* AIX is always big endian */
#define be64toh(x) (x)
#define be32toh(x) (x)
#define be16toh(x) (x)
#define le32toh(x)             \
	((((x) & 0xff) << 24) |    \
	(((x) & 0xff00) << 8) |    \
	(((x) & 0xff0000) >> 8) |  \
	(((x) & 0xff000000) >> 24))
#define le64toh(x)                          \
	((((x) & 0x00000000000000ffL) << 56) |  \
	(((x) & 0x000000000000ff00L) << 40) |   \
	(((x) & 0x0000000000ff0000L) << 24) |   \
	(((x) & 0x00000000ff000000L) << 8)  |   \
	(((x) & 0x000000ff00000000L) >> 8)  |   \
	(((x) & 0x0000ff0000000000L) >> 24) |   \
	(((x) & 0x00ff000000000000L) >> 40) |   \
	(((x) & 0xff00000000000000L) >> 56))
#ifndef htobe64
#define htobe64(x) be64toh(x)
#endif
#ifndef htobe32
#define htobe32(x) be32toh(x)
#endif
#ifndef htobe16
#define htobe16(x) be16toh(x)
#endif
#ifndef htole32
#define htole32(x) le32toh(x)
#endif
#endif