Lua 5.2 upgrade [1] for NSE.

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

scripts/http-google-malware.nse

@@ -1,3 +1,9 @@
+local http = require "http"
+local nmap = require "nmap"
+local shortport = require "shortport"
+local stdnse = require "stdnse"
+local string = require "string"
+
 description = [[
 Checks if hosts are on Google's blacklist of suspected malware and phishing servers. These lists are constantly updated and are part of Google's Safe Browsing service.
 
@@ -27,8 +33,6 @@ author = "Paulino Calderon"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"malware", "discovery", "safe", "external"}
 
-require "http"
-require "shortport"
 
 portrule = shortport.http