(svn r20902) -Fix [FS#4032]: Make IsProductionAlterable() work for most NewGRF industries.

The NewGRF either has to use properties 12/13, or it needs to set property 0B to 'primary industry'.
 So it will not work for bank-like industries which use pure production-callback production.

src/industry_gui.cpp

@@ -624,8 +624,9 @@ static void UpdateIndustryProduction(Industry *i);
 
 static inline bool IsProductionAlterable(const Industry *i)
 {
+	const IndustrySpec *is = GetIndustrySpec(i->type);
 	return ((_game_mode == GM_EDITOR || _cheats.setup_prod.value) &&
-			(i->accepts_cargo[0] == CT_INVALID || i->accepts_cargo[0] == CT_VALUABLES));
+			(is->production_rate[0] != 0 || is->production_rate[1] != 0 || is->IsRawIndustry()));
 }
 
 /** Names of the widgets of the view industry gui */