updated for version 7.3.085

Problem:    Inconsistency with preproc symbols.  void * computation.
Solution:   Include vimio.h from vim.h.  Add type cast.

src/os_msdos.c

@@ -21,7 +21,6 @@
  * Some functions are also used for Win16 (MS-Windows 3.1).
  */
 
-#include "vimio.h"
 #include "vim.h"
 
 #include <conio.h>