Removed the vi format comments from the source

Vim users can use the [editorconfig plugin](https://github.com/editorconfig/editorconfig-vim) to automatically set tab spacing for the SDL coding style.

Fixes https://github.com/libsdl-org/SDL/issues/6903

src/stdlib/SDL_malloc.c

@@ -5328,5 +5328,3 @@ void SDL_free(void *ptr)
     s_mem.free_func(ptr);
     (void)SDL_AtomicDecRef(&s_mem.num_allocations);
 }
-
-/* vi: set ts=4 sw=4 expandtab: */