fix the way endianness is detected

[edwardrf]

I believe the code used to detect endianness is similar to this thread: http://lua-users.org/lists/lua-l/2008-11/msg00075.html.

However, the current code fails to detect the correct endianness on openWRT system on a MIPS cpu (which is big endian)

[ToxicFrog]

What does the extra argument to string.dump() do? It's not documented anywhere and on lua 5.2/linux it doesn't seem to have any effect.

[edwardrf]

sorry, i had the position of the bracket wrong. It is fixed now, the argurment is to the string.byte function, not to dump.

[ToxicFrog]

That makes more sense :)

Re-reading the binary chunk spec, it looks like this has always been broken; I just don't have any big-endian machines to test it on, so I never noticed.