[ODE] Unstable Commit: fixed segfault with OPCODE on 64 bits systems

[Tanguy Fautre]

On 64 bits systems, OPCODE now uses 64 bits integers during 
pointer-to-integers conversions (also when storing pointer values using 
integers).

This modification does *not* affect 32 bits systems, which will still 
uses 32 bits integers, even though the code is the same for both.

This fixes an ugly segmentation fault that was making trimesh collisions 
useless on 64 bits systems.


Regards,

Tanguy