- do not use SDL_free() on C.CString() items that were allocated by go's own
  memory management routines, since SDL_malloc() and SDL_free() might use an
  own memory manager (dlmalloc), if malloc() is not available on the target
  platform, the SDL2 library was built for
Merge pull request #21 from marcusva/master

Do not use SDL_free() on C.CString() items