Issue 4910, patch 2 of (probably) 3: pave the way for renaming of
nb_long:  remove last remaining use of nb_long
(in the struct module) from the core, set nb_long slots on all builtin
and extension types to 0, and remove uses of __long__ in test_complex
and test_binop.

Reviewed by Benjamin Peterson.
diff --git a/Modules/_struct.c b/Modules/_struct.c
index a9b1ffa..a99e7f2 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -127,8 +127,8 @@
 		return v;
 	}
 	m = Py_TYPE(v)->tp_as_number;
-	if (m != NULL && m->nb_long != NULL) {
-		v = m->nb_long(v);
+	if (m != NULL && m->nb_int != NULL) {
+		v = m->nb_int(v);
 		if (v == NULL)
 			return NULL;
 		if (PyLong_Check(v))