bug#51377: Automatically exit server when it has no remaining clients

[Gregory Heytings]

> Here's a combined patch, which implements the two desired behaviors, and 
> which I believe handles all cases properly: delete-frame, 
> handele-delete-frame, save-buffers-kill-terminal, wait and nowait 
> clients.

It just occurred to me that it's very easy to add a third behavior, namely 
the one you expect, but only when the last frame is killed with C-x C-c. 
See attached patch.

Options-to-automatically-stop-the-Emacs-server.patch
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