Dag-Erling Smørgrav 3869fb7832 Add options to capture stdout and / or stderr and pass the output on
to the user.  There is currently no buffering, so the result may be
somewhat unpredictable if the conversation function adds a newline,
like openpam_ttyconv() does.

Clean up and simplify the environment handling code, which triggered
an inexplicable bug on some systems.

MFC after:	2 weeks
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