Implemented Informix special way to treat NULLs, removed warnings, synced.

Michael Meskes <meskes@postgresql.org>

Commit: fd3ca524ebb12acaf582e60366fe39a58b4bd0a4
Author: Michael Meskes <meskes@postgresql.org>
Date: 2003-06-25T10:44:21Z
Releases: 7.4.1
Implemented Informix special way to treat NULLs, removed warnings, synced.

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