jilles caf58c06dc sh: Pass through SIGINT from a child if interactive and job control
is enabled.

This already worked if without job control.

In either case, this depends on it that a process that terminates due to
SIGINT exits on it (so not with status 1, or worse, 0).

Example:
  sleep 5; echo continued
This does not print "continued" any more if sleep is aborted via ctrl+c.

MFC after:	1 month
2010-06-06 22:27:32 +00:00
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