bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis <ed.avis@qmaw.com>]

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Following the original recipe I'm seeing a slightly different crash.  Emacs doesn't exit all the way back to the original shell prompt but hangs instead.  The output left on the screen looks fun:

Waiting for Emacs...  M-x c o m i n t - s t o p - s u b j o b RET
[1]+  Stopped                 emacsclient foo
eda@qmaw-linux05 ~ $
-UUU:**--F1  *shell*        Bot L16838  (Shell:run) --------------------------------------------------------------------

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