small dpkg completion update patch

[Jesse W <jessw@netwood.net>]

I've written a tiny patch for _dpkg, the completion function for dpkg, 
and dpkg-deb.  It adds the --show option, which was added to dpkg-deb 
(but not dpkg) in version 10.1.  I'm intending to hack up completion 
for dpkg-query evetually, so this is also sort of a training for me in 
the process of creating and sending in patches for zsh.  If I've done 
anything wrong, please let me know.  The patch is included below.

	Jesse Weinstein

*** /Users/jesse/_dpkg.old	Wed May  4 17:00:21 2005
--- /Users/jesse/_dpkg	Wed May  4 17:07:56 2005
***************
*** 2,9 ****
--- 2,13 ----

   local _dpkg_deb_actions _dpkg_common_actions _dpkg_actions 
_dpkg_options
   local _dpkg_options_recursive _dpkg_actions_install 
_dpkg_actions_record_avail
+ local _dpkg_deb_only_actions
   local curcontext="$curcontext" context state line expl ret
   typeset -A opt_args
+ _dpkg_deb_only_actions=(
+     '(--show -W)'{--show,-W}'[show package info]:Debian 
package:_files -g \*.u\#deb'
+     )

   _dpkg_deb_actions=(
     '(--build -b)'{--build,-b}'[build archive]:directory:_files -/'
***************
*** 83,89 ****

   dpkg-deb)
   _arguments "$_dpkg_deb_actions[@]" \
!            "$_dpkg_common_actions[@]" && return 0

   ;;

--- 87,94 ----

   dpkg-deb)
   _arguments "$_dpkg_deb_actions[@]" \
!            "$_dpkg_common_actions[@]" \
!            "$_dpkg_deb_only_actions[@]" && return 0

   ;;