On Windows, Delete the CriticalSection's we Initialize

rts/win32/AsyncIO.c

@@ -189,6 +189,7 @@ shutdownAsyncIO(rtsBool wait_threads)
         CloseHandle(completed_table_sema);
 	completed_table_sema = NULL;
     }
+    DeleteCriticalSection(&queue_lock);
 }
 
 /*

rts/win32/IOManager.c

@@ -461,6 +461,8 @@ void ShutdownIOManager ( rtsBool wait_threads )
         }
         FreeWorkQueue(ioMan->workQueue);
         CloseHandle(ioMan->hExitEvent);
+        DeleteCriticalSection(&ioMan->active_work_lock);
+        DeleteCriticalSection(&ioMan->manLock);
         free(ioMan);
         ioMan = NULL;
     }

rts/win32/WorkQueue.c

@@ -82,6 +82,7 @@ FreeWorkQueue ( WorkQueue* pq )
   if ( pq->roomAvailable ) {
     CloseHandle(pq->roomAvailable);
   }
+  DeleteCriticalSection(&pq->queueLock);
   free(pq);
   return;
 }