[BUG] can't start supertux because it expects files in wrong places

[Leonid Bobrov]

Hi!

$ supertux2
[FATAL]
/usr/obj/ports/supertux-0.6.0/SuperTux-v0.6.0-Source/src/supertux/main.cpp:604
Unexpected exception: boost::filesystem::status: Permission denied:
"/usr/obj/ports/supertux-0.6.0/SuperTux-v0.6.0-Source/data/credits.stxt"