Disable cocoa generator for non v6 mapgens

mods/ITEMS/mcl_cocoas/init.lua

@@ -184,9 +184,9 @@ crop_def.selection_box = {
 crop_def.drop = "mcl_dye:brown 3"
 minetest.register_node("mcl_cocoas:cocoa_3", table.copy(crop_def))
 
--- Add random cocoa pods to jungle trees
+-- Add random cocoa pods to jungle trees (v6 only)
 
--- TODO: Do this more efficiently, with LuaVoxelManip
+if minetest.get_mapgen_setting("mg_name") == "v6" then
 	minetest.register_on_generated(function(minp, maxp)
 
 		if maxp.y < 0 then
@@ -229,6 +229,7 @@ minetest.register_on_generated(function(minp, maxp)
 			end
 		end
 	end)
+end
 
 minetest.register_abm({
 		label = "Cocoa growth",