* Do not require cmi file to be present if module alias is not accessed
      (using -trans-mod)
    * Add warning 49 for that case; use same warning in place of deprecated
      for Env.scrape_alias
    
    
    git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14724 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02