Carbon port - mouse wheel broken

[David Reitter]

some recent change broke mouse wheel support in the Carbon port.
I get a lot of "[double|triple]wheel-{up|down} undefined" messages.

this happens with trackpad two-finger scrolling and with an external  
mouse.

====

In GNU Emacs 22.0.50.1 (powerpc-apple-darwin7.9.0)
of 2005-10-29 on rodrigues.inf.ed.ac.uk
X server distributor `Apple Computers', version 10.4.2
configured using `configure '--without-x' '--prefix=/usr/local''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  encoded-kbd-mode: t
  recentf-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
<wheel-down> <double-wheel-down> <wheel-down> <double-wheel-down>
<triple-wheel-up> <wheel-up> <wheel-up> <double-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-up> <wheel-up> <wheel-down> <double-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <wheel-down> <double-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <help-echo> <help-echo> <menu-bar>
<help-menu> <report-emacs-bug>

Recent messages:
(/Volumes/Sista/Applications/Emacs.app/Contents/MacOS/Emacs)
Loading disp-table...done
Loading /Applications/TeXniscope.app/Contents/Resources/txs-search.el  
(source)...done
Loading recentf...done
Loading /Users/dr/Library/Preferences/Aquamacs Emacs/Recent Files.el  
(source)...done
Cleaning up the recentf list...done (0 removed)
For information about the GNU Project and its goals, type C-h C-p.
Loading emacsbug...done
Loading encoded-kb...done