Previously, the exit info in Eshell was that of the last command that
finished, rather than the last command in a pipeline.
* lisp/eshell/esh-cmd.el (eshell-exec-lisp)
(eshell-lisp-command): Check whether the command is being piped.
* lisp/eshell/esh-proc.el (eshell-gather-process-output): Record whether
the command is being piped...
(eshell-sentinel): ... and do the right thing with that info.
* test/lisp/eshell/esh-proc-tests.el
(esh-proc-test/sigpipe-exits-process): Check the exit status to ensure
we don't report the first process's SIGPIPE exit.
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