Fix make check-c-globals

Author: vstinner

Tools/c-analyzer/cpython/ignored.tsv

@@ -318,6 +318,7 @@ Objects/exceptions.c	-	static_exceptions	-
 Objects/genobject.c	-	ASYNC_GEN_IGNORED_EXIT_MSG	-
 Objects/genobject.c	-	NON_INIT_CORO_MSG	-
 Objects/longobject.c	-	_PyLong_DigitValue	-
+Objects/longobject.c	-	PyUnstable_Long_LAYOUT	-
 Objects/object.c	-	_Py_SwappedOp	-
 Objects/object.c	-	_Py_abstract_hack	-
 Objects/object.c	-	last_final_reftotal	-