Require the deprecation mixin in all modules

Because rememberin to require it, and hoping against a race is not how we
roll any more.

lib/msf/core/module.rb

@@ -104,6 +104,7 @@ class Module
   require 'msf/core/module/target'
   require 'msf/core/module/auxiliary_action'
   require 'msf/core/module/has_actions'
+  require 'msf/core/module/deprecated'
 
   #
   # Creates an instance of an abstract module using the supplied information

modules/exploits/windows/brightstor/tape_engine_8A.rb

@@ -6,7 +6,6 @@
 ##
 
 require 'msf/core'
-require 'msf/core/module/deprecated'
 
 class Metasploit3 < Msf::Exploit::Remote
 

modules/exploits/windows/fileformat/a-pdf_wav_to_mp3.rb

@@ -6,7 +6,6 @@
 ##
 
 require 'msf/core'
-require 'msf/core/module/deprecated'
 
 class Metasploit3 < Msf::Exploit::Remote
   Rank = NormalRanking