Separated the MZ loader and core DOS VM into dlls/winedos.

diff --git a/msdos/int33.c b/msdos/int33.c
index 90619a5..7a8ee43 100644
--- a/msdos/int33.c
+++ b/msdos/int33.c
@@ -9,6 +9,7 @@
 #include "wingdi.h"
 #include "winuser.h"
 #include "miscemu.h"
+#include "callback.h"
 #include "dosexe.h"
 #include "vga.h"
 #include "debugtools.h"
@@ -150,6 +151,6 @@
     data->but = mouse_info.but;
     data->x = mouse_info.x;
     data->y = mouse_info.y;
-    DOSVM_QueueEvent(-1, DOS_PRIORITY_MOUSE, MouseRelay, data);
+    Dosvm.QueueEvent(-1, DOS_PRIORITY_MOUSE, MouseRelay, data);
   }
 }