bug#1319: Change in where-is-internal causing describe-key problems

[Geoff Gole]

The behaviour of where-is-internal has changed in CVS emacs. Enter
view mode, M-: (where-is-internal 'self-insert-command nil nil nil) :

  22.2  => ([491520] [458752] [442368] [425984] [409600]...)
  CVS   => ([(128 . 4194303)])

This change breaks describe-function-1, used internally in
describe-key, causing a bound key to be printed as a non-ascii
character in some conditions. To reproduce the problem:

  emacs -Q
  C-h k k
  Switch to the *Help* buffer
  C-h k k

where-is-internal seems to be buggy, but perhaps describe-function-1
should also be doing more checking. I'm not sure if it should handle
input of the form ([(128 . 4194303)]) or not.