Remove bin.lua packing from more scripts

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

@@ -1,4 +1,3 @@
-local bin = require "bin"
 local msrpc = require "msrpc"
 local smb = require "smb"
 local string = require "string"
@@ -110,9 +109,9 @@ from an anonymous connection.
   end
 
   -- create malicious packet, same as in the PoC
-  local data = bin.pack("<I",4096)  -- num_sids
+  local data = string.pack("<I4",4096)  -- num_sids
     .. "abcd"
-    ..bin.pack("<III",100
+    ..string.pack("<I4I4I4",100
       ,0
       ,100)
     ..string.rep("a",1000)