init.el: break auto-complete-mode dead lock
init.el: break auto-complete-mode dead lock

If auto-complete-mode is not installed, then there will be a deadlock:
installing auto-complete-mode loads prog-mode in the process,
prog-mode-hook calls auto-complete-mode.

Now I'm putting the auto-complete-mode in prog-mode-hook in a
condition-case, trapping and mitigating the error so that the
installation could continue.

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