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_crc16.c

@@ -50,5 +50,3 @@ Uint16 SDL_crc16(Uint16 crc, const void *data, size_t len)
     }
     return crc;
 }
-
-/* vi: set ts=4 sw=4 expandtab: */