[quake3] first win64 patch

[Ludwig Nussel]

James Lacey wrote:
> Here is my first Win64 Quake 3 patch. A couple of notes:

I've now changed the code to use intptr_t instead of long where I
think it needs to. Since long works fine on Linux I can't check
whether I catched everything though. Would be nice if you could try
to create a minimal patch (ie without the size_t changes) based on
that to make it work on 64bit Windows. 

cu
Ludwig

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