Cannot run URW from different folder

[BrownFox]

"Installed" URW on Debian from tar.gz. Game runs without problems, but:

~$ ./Games/UnReal_World/urw3-bin
Segmentation fault
~$ cd Games/UnReal_World/
Games/UnReal_World/$ ./urw3-bin
Game starts normally without problems...

Fix: do not assume the game resources are in the folder where the game is being run, but in the folder where the executable is.