Bug#4329: Emacs has hardcoded path for jka-compr, breaks at upgrade

[Ian Jackson <ian@chiark.chu.cam.ac.uk>]

Package: emacs
Version: 19.31-2

I just upgraded from 19.29-3, and it left me with the following
/etc/site-start.el:
 (load "/usr/lib/emacs/19.29/lisp/jka-compr.elc")
 (if (file-exists-p "/usr/lib/emacs/site-lisp/w3-init.el") (load "w3-init"))
 (autoload 'lout-mode "lout-mode" "Mode for editing Lout source" t)
 (setq auto-mode-alist (append '(("\\.lout$" . lout-mode)) auto-mode-alist))
 (require 'vm-init)

This caused Emacs to fail to start because of the changed version
number in the pathname for jka-compr.

IMO this entry should not have used an absolute pathname, rather, it
should rely on the load-path.

If it did need an absolute pathname the Emacs postinst should have
fixed it up.

Ian.