Make pg_dump and friends consistently report both the filename and the

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 27c033ed98d0ed8ee05caf440ae648f42fa5f9d6
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-10-28T21:55:52Z
Releases: 8.3.0
Make pg_dump and friends consistently report both the filename and the
errno string when complaining of fopen failures.  Per gripe from Bob
Pawley, it's not always instantly obvious to the user which name we
tried to open.

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