More cleanups to separate main code from platform support and UI support, plus a few bugfixes.

src/win/win_mouse.cc

@@ -8,7 +8,7 @@
  *
  *		Mouse interface to host device.
  *
- * Version:	@(#)win_mouse.cc	1.0.3	2017/10/10
+ * Version:	@(#)win_mouse.cc	1.0.4	2017/10/12
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -18,6 +18,7 @@
  */
 #define DIRECTINPUT_VERSION 0x0800
 #include <dinput.h>
+#include <stdio.h>
 #include <stdint.h>
 #include "../plat.h"
 #include "../plat_mouse.h"