give a little info as to what the file should contain

libc/sysdeps/linux/common/bits/endian.h

@@ -11,3 +11,8 @@
 #endif
 
 #error Machine byte order unknown.
+
+#if 0
+#define __BYTE_ORDER __BID_ENDIAN
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#endif