Lua 5.2 upgrade [1] for NSE.

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

scripts/samba-vuln-cve-2012-1182.nse

@@ -1,3 +1,9 @@
+local bin = require "bin"
+local msrpc = require "msrpc"
+local smb = require "smb"
+local string = require "string"
+local vulns = require "vulns"
+
 description = [[
 Check if the machine is vulnerable to Samba heap overflow vulnerability
 marked with CVE-2012-1182. 
@@ -55,10 +61,6 @@ author = "Aleksandar Nikolic"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"vuln","intrusive"}
 
-require 'msrpc'
-require 'smb'
-require 'stdnse'
-require 'vulns'
 hostrule = function(host)
 	return smb.get_port(host) ~= nil
 end