[aquaria] [PATCH] Variable type changes and extra include file for compiling in Linux (and probably Mac)

[Ryan C. Gordon]

> I'm not sure this is the right fix. In some platforms, int is the
> right choice, and it's not necessarily the best idea to always use
> long or int. Thankfully, C provides the uintptr_t typedef for just
> this purpose which I used in my patch.

Again, this won't work either; Lua stores numbers as 64-bit doubles, 
which means it's not safe to store 64-bit pointers in them.

These pointers will have to become lightuserdata, and the Lua scripts 
will need to be fixed to not compare them against zero.

--ryan.