Carbon port: setting the creator code (patch)

[David Reitter]

I'm posting some code that introduces a function "mac-set-creator" in  
the Mac (Carbon) port. The function sets the creator code (metadata  
information) of a file to 'EMAx'. That enables LaunchServices to  
start up Emacs whenever the file is double-clicked.

In the Aquamacs distribution, I use it as follows:

(defun mac-set-creator-code-for-file ()
  (if (and aquamacs-set-creator-codes-after-writing-files
       buffer-file-name
       (fboundp 'mac-set-creator)
       )
      (mac-set-creator buffer-file-name)
    )
  )

(add-hook 'after-save-hook 'mac-set-creator-code-for-file)

This contains some free code from Apple.

mac-set-creator.patch
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