fix incompatibility with old mcl_weather

mods/ENVIRONMENT/mcl_weather/init.lua

@@ -21,7 +21,7 @@ local interval=1
 function mcl_weather.register_weather(name,def)
 	mcl_weather.registered_weathers[name] = def
 end
-
+local modpath=minetest.get_modpath(minetest.get_current_modname())
 dofile(modpath.."/skycolor.lua")
 dofile(modpath.."/snow.lua")
 dofile(modpath.."/rain.lua")
@@ -35,6 +35,19 @@ function mcl_weather.get_weatherdef(name)
 	return mcl_weather.registered_weathers["none"]
 end
 
+function mcl_weather.get_weather()
+	return mcl_weather.current
+end
+
+function mcl_weather.get_current_light_factor()
+	local lf = mcl_weather.get_weatherdef(mcl_weather.current).light_factor
+	if mcl_weather.current == "none" or not lf then
+		return nil
+	else
+		return lf
+	end
+end
+
 -- Returns true if pos is outdoor.
 -- Outdoor is defined as any node in the Overworld under open sky.
 -- FIXME: Nodes below glass also count as “outdoor”, this should not be the case.