bug#3852: 23.0.95; set-language-environment-charset doesn't handle non-lists

"Per Starbäck" <[email protected]>
Newsgroups gmane.emacs.bugs,gmane.emacs.pretest.bugs
Message-ID <[email protected]> 
In GNU Emacs 23.0.95.1 (i686-pc-linux-gnu, GTK+ Version 2.10.4)

Bug:
  Options->Mule->Set Language Environment->IPA
  yields error "Wrong type argument: listp, iso-2022".

Reason:
  coding-system-charset-list normally returns a list, but `iso-2022'
  is one of two special other values it can return.

  set-language-environment-charset doesn't know about those special
  values, but expects a list when it does
  (coding-system-charset-list 'iso-2022-7bit).
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