(svn r13412) -Add: OTTDThreadTerminateFunc, for all thread systems, which is called when a thread is terminated. Now GenWorld- and SaveLoad-thread cleanup theirselves correctly, while Fibers don't (as that causes access-violations)

src/thread_os2.cpp

@@ -59,7 +59,7 @@ void OTTDExitThread()
 
 #endif
 
-/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param)
+/* static */ ThreadObject *ThreadObject::New(OTTDThreadFunc proc, void *param, OTTDThreadTerminateFunc terminate_func)
 {
 	return NULL;
 }