Fast fix to provide compatibility with the recent version of libfallterg...

I am able to compile falltergeist now, but it crashes because of std::out_of_range on line 118.
And it shouldn't because the changes I made are very simple and obvious.
I don't know the code well enough to find out what happened, so I hope you will fix the issue :).

P.S. Why did you make the change in libfalltergeist anyway? I mean why changing sdt::string to char *? You don't like C++ :)? Or is it something else?