Documentation: support glibc versions without htole macros

glibc 2.9 introduced the htole<16/32/64> macros, add them to
tools/include to support older versions of glibc.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Foley <pefoley2@pefoley.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

tools/include/tools/endian.h

@@ -0,0 +1,32 @@
+#ifndef _TOOLS_ENDIAN_H
+#define _TOOLS_ENDIAN_H
+
+#include <byteswap.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+
+#ifndef htole16
+#define htole16(x) (x)
+#endif
+#ifndef htole32
+#define htole32(x) (x)
+#endif
+#ifndef htole64
+#define htole64(x) (x)
+#endif
+
+#else /* __BYTE_ORDER */
+
+#ifndef htole16
+#define htole16(x) __bswap_16(x)
+#endif
+#ifndef htole32
+#define htole32(x) __bswap_32(x)
+#endif
+#ifndef htole64
+#define htole64(x) __bswap_64(x)
+#endif
+
+#endif
+
+#endif /* _TOOLS_ENDIAN_H */