Land rapid7#7054, Fix busted alpha encoding on ms02_018_htr

Author: pbarry-r7

modules/exploits/windows/iis/ms02_018_htr.rb

@@ -49,6 +49,7 @@ def initialize(info = {})
           ['Windows NT 4.0 SP4', {'Platform' => 'win', 'Rets' => [ 593, 0x77f7635d ] }],
           ['Windows NT 4.0 SP5', {'Platform' => 'win', 'Rets' => [ 589, 0x77f76385 ] }],
         ],
+      'DefaultOptions' => { 'AllowWin32SEH' => true }, # needed for pure alpha GetEIP stub
       'DisclosureDate' => 'Apr 10 2002',
       'DefaultTarget' => 0))