[fixed] Wings 3D (x64) 2.2.5 not closing

[micheus]

Thanks for the tip.
The simple erl -pa C:/wingsdev/src/wings/ebin -run wings_start start_halt helped to reproduce the problem on Windows 7.

As I could to track it's something beyond Wings3D code because every piece of code ran until the last command when it hangs.
It's something for dgud evaluation - it's far away from Erlang knowledge.