Added better missing function emulation.

diff --git a/misc/winsock_async.c b/misc/winsock_async.c
index 17852ae..df88bd7 100644
--- a/misc/winsock_async.c
+++ b/misc/winsock_async.c
@@ -83,6 +83,7 @@
 #include "task.h"
 #include "message.h"
 #include "miscemu.h"
+#include "wine/port.h"
 #include "debugtools.h"
 
 DEFAULT_DEBUG_CHANNEL(winsock)