battery_box.lua: Make "srcstack" local (#525)

fgrosswig

2020-01-06 e90b28895cc28daf1a2e4fb772bd191400cf9e62

 technic/tools/init.lua

@@ -13,4 +13,11 @@
dofile(path.."/chainsaw.lua")
dofile(path.."/tree_tap.lua")
dofile(path.."/sonic_screwdriver.lua")
dofile(path.."/prospector.lua")
dofile(path.."/vacuum.lua")

if minetest.get_modpath("screwdriver") then
   -- compatibility alias
   minetest.register_alias("technic:screwdriver", "screwdriver:screwdriver")
end