redundant defcustom in autorevert.el

[Matt Swift]

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In GNU Emacs 20.7.2 (i386-debian-linux-gnu, X toolkit)
 of Tue Jul 25 2000 on raven
configured using `configure  i386-debian-linux-gnu --prefix=/usr 
--sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib 
--infodir=/usr/share/info --with-pop=yes --with-x=yes --with-x-toolkit=yes'

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The following lines which define the same variable twice appear in
autorevert.el:

    (defcustom global-auto-revert-non-file-buffers nil
      "*When nil only file buffers are reverted by Global Auto-Revert Mode.

    When non-nil, both file buffers and buffers with a custom
    `revert-buffer-function' are reverted by Global Auto-Revert Mode."
      :group 'auto-revert
      :type 'boolean)

    (defcustom global-auto-revert-non-file-buffers nil
      "When nil only file buffers are reverted by Global Auto-Revert Mode.

    When non-nil, both file buffers and buffers with a custom
    `revert-buffer-function' are reverted by Global Auto-Revert Mode.

    Use this option with care since it could lead to excessive reverts."
      :group 'auto-revert
      :type 'boolean)


Recent input:
f e r - f u n c t i o n C-s C-s C-s C-s C-a C-v M-< 
C-s C-s C-s C-s C-a down down down down down down down 
down down down down down down down down down down down 
down down down down C-n C-n C-p M-f C-h f return M-1 
down-mouse-1 mouse-1 C-h f return M-1 C-s r e v e r 
t - f backspace b u f f e r - f u n c t i o n C-s C-s 
switch-frame M-x r e p o r t - e m tab return

Recent messages:
Type C-x 1 to remove help window.  M-C-v to scroll the help.
Reverting buffer `filenames.log'. [8 times]
TRACE current buffer autorevert.el
Reverting buffer `filenames.log'.
Mark saved where search started
Loading emacsbug...
Loading emacsbug...done
Reverting buffer `filenames.log'. [3 times]
Buffer is read-only: #<buffer autorevert.el>
Reverting buffer `filenames.log'.
None