[ODE] ANN : Update ODE distribution!!!

[Roel van Dijk]

> I saw this clean way of doing it, the other day ;)
>
> http://www.flipcode.com/cgi-bin/msg.cgi?showThread=Tip-AutomaticCPUDetectio
>n&forum=totd&id=-1
>
> It's really simply, and you only have to run the SSE detecion one time ;)
I think you could also do it using #defines, that way there's absolutely no 
overhead. But then you would have to know to CPU model at compile time.
And maybe current compilers optimize so good that using a function pointer 
doesn't produce overhead either.