[compilation-mode] Watch for sudo prompt

[Lluís]

Is there a reliable way to make compilation-mode ask the user for a password
when it sees the typical sudo prompt?

Otherwise it gets stuck waiting for the password and there is no way to write it
except running the command in a shell (although I've found it sometimes works if
I first run the command in `shell', but I'm not sure when nor who triggers this
behaviour).


Thanks,
  Lluis

-- 
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