Docstring for archive-zip-extract

[Sven Joachim]

The docstring for the user option `archive-zip-extract' in
lisp/arc-mode.el mentions the variable `archive-zip-use-pkzip', which
has been deleted. The following patch fixes this. Would somebody
please install it?

*** arc-mode.el~        2005-08-07 00:13:41.000000000 +0200
--- arc-mode.el 2005-10-16 13:55:30.000000000 +0200
***************
*** 225,232 ****
      '("unzip" "-qq" "-c"))
    "*Program and its options to run in order to extract a zip file member.
  Extraction should happen to standard output.  Archive and member name will
! be added.  If `archive-zip-use-pkzip' is non-nil then this program is
! expected to extract to a file junking the directory part of the name."
    :type '(list (string :tag "Program")
                (repeat :tag "Options"
                        :inline t
--- 225,231 ----
      '("unzip" "-qq" "-c"))
    "*Program and its options to run in order to extract a zip file member.
  Extraction should happen to standard output.  Archive and member name will
! be added."
    :type '(list (string :tag "Program")
                (repeat :tag "Options"
                        :inline t