Revision 110444 breaks the native MS-Windows build

[Eli Zaretskii]

Error messages look like this:

  image.c:6081: error: `fn_jpeg_start_decompress' declared as function 
returning a function
  image.c:6082: error: `fn_jpeg_finish_decompress' declared as function 
returning a function
  image.c:6087: error: `fn_jpeg_resync_to_restart' declared as function 
returning a function
  image.c:6112: error: `jpeg_resync_to_restart_wrapper' declared as function 
returning a function
  image.c:6136: error: field `cinfo' has incomplete type
  image.c: In function `my_error_exit':
  image.c:6152: error: dereferencing pointer to incomplete type
  image.c: At top level:
  image.c:6185: error: `our_memory_fill_input_buffer' declared as function 
returning a function