make addOrePrefix public

Author: serenibyss

src/main/java/gregtech/common/items/MetaItems.java

@@ -586,7 +586,8 @@ private static void registerSpecialItemModel(ModelBakeEvent event, MetaValueItem
         event.getModelRegistry().putObject(modelResourceLocation, bakedModel);
     }
 
-    private static void addOrePrefix(OrePrefix orePrefix) {
+    @SuppressWarnings("unused")
+    public static void addOrePrefix(OrePrefix orePrefix) {
         orePrefixes.add(orePrefix);
     }
 }