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

diff --git a/include/miscemu.h b/include/miscemu.h
index eeaabcf..d8ff015 100644
--- a/include/miscemu.h
+++ b/include/miscemu.h
@@ -238,6 +238,7 @@
 /* msdos/dpmi.c */
 typedef void WINAPI (*RMCBPROC)(CONTEXT86*);
 extern void WINAPI INT_Int31Handler(CONTEXT86*);
+extern BOOL DPMI_LoadDosSystem(void);
 extern FARPROC16 WINAPI DPMI_AllocInternalRMCB(RMCBPROC);
 extern void WINAPI DPMI_FreeInternalRMCB(FARPROC16);
 extern int DPMI_CallRMProc(CONTEXT86*,LPWORD,int,int);