[Gtkradiant] 45 degree model clipping q3map2 fix

[Nerius Landys]

I committed a fix to q3map2 which fixes model clipping where the model tris
are at 45 degree angles to the axis planes.

Windows build here if you want to try it:
http://porky.nerius.com/radiant-windows-builds/ZeroRadiant_Win_2011-01-18.zip

- Rambetter
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