add custom includes to labor_kitchen_interface_food_key

Author: ab9rf

df.d_interface.xml

@@ -1974,7 +1974,8 @@
         <enum-item name='OTHER'/>
     </enum-type>
 
-    <struct-type type-name='labor_kitchen_interface_food_key'>
+    <struct-type type-name='labor_kitchen_interface_food_key' custom-methods='true'>
+        <extra-include filename='df/custom/hash/labor_kitchen_interface_food_key.h'/>
         <enum name='type' type-name='item_type'/>
         <int16_t name='subtype'/>
         <int16_t name='mat'/>