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.

PC/winreg.c

@@ -451,7 +451,7 @@ static PyNumberMethods PyHKEY_NumberMethods =
 	PyHKEY_binaryFailureFunc,	/* nb_xor */
 	PyHKEY_binaryFailureFunc,	/* nb_or */
 	PyHKEY_intFunc,			/* nb_int */
-	PyHKEY_unaryFailureFunc,	/* nb_long */
+	0,				/* nb_long */
 	PyHKEY_unaryFailureFunc,	/* nb_float */
 };