Fix buildbot errors on Windows

Do not use CloseHandle() on thread id. It is not a kernel handle.

storage/innobase/row/row0ftsort.cc

@@ -1098,10 +1098,6 @@ fts_parallel_tokenization(
 	os_event_set(psort_info->psort_common->sort_event);
 	psort_info->child_status = FTS_CHILD_EXITING;
 
-#ifdef __WIN__
-	CloseHandle((HANDLE)psort_info->thread_hdl);
-#endif /*__WIN__ */
-
 	os_thread_exit();
 
 	OS_THREAD_DUMMY_RETURN;