Lua 5.2 upgrade [1] for NSE.

[1] http://seclists.org/nmap-dev/2012/q2/34

nselib/informix.lua

@@ -75,7 +75,11 @@
 --							   queries
 --
 
-module(... or "informix", package.seeall)
+local bin = require "bin"
+local nmap = require "nmap"
+local stdnse = require "stdnse"
+local table = require "table"
+_ENV = stdnse.module("informix", stdnse.seeall)
 
 -- A bunch of constants
 Constants =
@@ -1387,4 +1391,6 @@ Helper = {
 		return self.socket:close()
 	end,
 	
-}
+}
+
+return _ENV;