Linking error on x86_64

[Urkle]

This was already discussed http://www.frictionalgames.com/forum/thread-3353.html
Newton 1.53 is 32-bit ONLY so there can be no 64bit linux build (hence why I never provided one). Suggestions to fix this are to upgrade to newton 2 (in development) or add in a bullet physics implementation (which will run on 64bit).

Also angelscript would need to be updated to a newer release that supports 64bit.