Use PQExpBuffer for error message in fe-auth.c.

Magnus Hagander <magnus@hagander.net>

Commit: 29ac718f476bef2690a8af2923e9d931ce6fb2c9
Author: Magnus Hagander <magnus@hagander.net>
Date: 2007-07-23T17:52:06Z
Releases: 8.3.0
Use PQExpBuffer for error message in fe-auth.c.
In passing, change functions that passedin both PGconn and
parts of it to just pass in the PGconn.

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