Added some more informix compatibility functions.

Michael Meskes <meskes@postgresql.org>

Commit: a50f285d8de0eeb24df5a54f077e7aa2fee8eeee
Author: Michael Meskes <meskes@postgresql.org>
Date: 2003-04-08T12:34:25Z
Releases: 7.4.1
Added some more informix compatibility functions.

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