Fixed header dependencies to be fully compatible with the Windows
headers (with help from Dimitrie O. Paun).

diff --git a/dlls/msvcrt/cppexcept.c b/dlls/msvcrt/cppexcept.c
index 36fdc24..cfbb7cd 100644
--- a/dlls/msvcrt/cppexcept.c
+++ b/dlls/msvcrt/cppexcept.c
@@ -26,6 +26,11 @@
 #include "config.h"
 #include "wine/port.h"
 
+#include <stdarg.h>
+
+#include "windef.h"
+#include "winbase.h"
+#include "winreg.h"
 #include "winternl.h"
 #include "msvcrt.h"
 #include "wine/exception.h"