Fix some MaxMain compile failures introduced by Hoikas' recent cleanup

Sources/Tools/MaxMain/GlobalUtility.cpp

@@ -48,6 +48,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #include "plMaxNode.h"
 
 #include <guplib.h>
+#include <notify.h>
 #pragma hdrstop
 
 #include "GlobalUtility.h"

Sources/Tools/MaxMain/plActionTableMgr.h

@@ -50,6 +50,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 
 class ActionCallback;
 struct ActionDescription;
+struct NotifyInfo;
 
 typedef bool(*ActionCallbackFunc)(int);