[Nel] error in 3d.dsp

[Eric Kervina]

I tried to compile from the latest CVS (using Visual C++ 6.0), and got some
errors indicating that the files water_env_map.cpp and
water_env_map_user.cpp did not exist or could not be opened.

It was looking for them on drive "R:".

In code\nel\src\3d.dsp there are two errors that point to R:\code... instead
of .\code...

Simple edit to fix them, but just a heads up.

Regards,
Eric