Another cleanup run.

src/disk/hdc_mfm_at.c

@@ -12,7 +12,7 @@
  *		based design. Most cards were WD1003-WA2 or -WAH, where the
  *		-WA2 cards had a floppy controller as well (to save space.)
  *
- * Version:	@(#)hdd_mfm_at.c	1.0.8	2017/10/14
+ * Version:	@(#)hdd_mfm_at.c	1.0.9	2017/10/16
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Fred N. van Kempen, <decwiz@yahoo.com>
@@ -28,6 +28,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <wchar.h>
+#include "../86box.h"
 #include "../ibm.h"
 #include "../device.h"
 #include "../io.h"