Run game with command line argsument, required video device

Some times we running game on servers without `video device`, 
and headless mode `megaglest --headless-server-mode=vps` works fine 

But if you want to  `./megaglest --list-techtrees` this return `Couldn't initialize SDL: No available video device`

I test a lot of commands everything but `megaglest --version` doesn't work

I think It's should work without `video device`