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/Objects/floatobject.c b/Objects/floatobject.c
index 20c1eef..7292ca5 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -1798,7 +1798,7 @@
 	0,		/*nb_xor*/
 	0,		/*nb_or*/
 	float_trunc,	/*nb_int*/
-	float_trunc,	/*nb_long*/
+	0,		/*nb_long*/
 	float_float,	/*nb_float*/
 	0,		/* nb_inplace_add */
 	0,		/* nb_inplace_subtract */