Porting fixes.

diff --git a/windows/message.c b/windows/message.c
index 317a720..cd4de4a 100644
--- a/windows/message.c
+++ b/windows/message.c
@@ -19,6 +19,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <stdarg.h>
 #include <stdlib.h>